please look at the text below (which from http://www.immihelp.com/greencard/adjustmentofstatus/changing-employer.html) since i found you have file an employment-based green card case. hopefully, it could help you.
Changing Employer Using AC 21 Portability Rule
Effective October 17, 2000, The American Competitiveness in the Twenty-First Century Act, (AC21) provides that approved I-140 petition for employment based green card would remain valid even when an alien changes jobs, if:
Employment based Adjustment of Status(I-485) has been filed and remained unadjudicated (pending) for 180 days or more; and
the new job is in the same or similar occupational classification as the job for which the certification or approval was initially made.
If an alien has complied with the above statutory requirements, adjudicators shall not deny applications for adjustment of status on the basis that the alien has changed jobs. Under present practices it is expected that an I-485 applicant notify the USCIS service center when they no longer intend to enter into employment with the employer who sponsored them on the I-140 petition. USCIS would continue to expect the applicant to submit a letter notifying USCIS of this change in intent. If the Adjudicator has reason to believe that the applicant's intent has changed, a Request For Evidence(RFE) may be issued to clarify the applicant's intent in regards to employment.
In instance where the applicant no longer intends to be employed by the employer who sponsored him/her on the I-140, the USCIS would request a letter of employment from the new employer. The letter from the new employer verifying that the job offer exists should contain the new job title, job deion and salary. This information is necessary to determine whether the new job is in the same or similar occupation and to determine whether the alien is admissible under the public charge ground of inadmissibility.
Similar job
What exactly 'similar' means is not very clear and it is subjective. To determine whether a new job is in the same or similar occupational classification as the original job for which the certification or approval was initially made, the adjudicating offer would consult the Department of Labor's Dictionary of Occupational Titles or its online O*NET classification system or similar publications. But these sources are somewhat vague in defining jobs, especially so in the IT industry. The DOT is quite outdated that and it contains no definitions for many IT jobs such as System Administrator. So, safest thing is to change jobs whose title and deion almost exactly matches the job under which the green card was originally filed. Even if the job title is not the same, as long as the job duties are the same or similar, you are fine. e.g., if you were .NET programmer earlier and if you accepted a job in Java programming now, your job duties are still essentially the same. You are still a programmer, and not a cook.
Counting days
180 days start from the receipt date of I-485 and not the notice date. In other words, the date when USCIS received your application, and not the date when they printed a receipt.
Pending I-140
AC 21 rule states that green card application would remain valid if the applicant changes employer after 180 days of I-485. When I-485 is filed concurrently with I-140, and it has been more than 6 months since I-140 is pending, and if the employee changes the employer, as long as the I-140 gets eventually approved, applicant can stilly utilize AC 21.
Intent
In employment based I-485 application, I-140 petitioning employer is required to maintain its intent to employ the petitioned employee upon approval of I-485. In case an employee changes the employer under AC 21 rule, new employer should retain such intent to employ the I-485 applicant for indefinite duration once I-485 is granted. Also, an employee should retain his/her intent to work indefinitely for the new employer at the time he/she takes new employment and through out the period of employment with new employer. If either employer or employee abandons such intent, USCIS may deny I-485 application and once granted, theoretically, USCIS might be able to revisit the adjudication of I-485 and initiate revocation processing.
Never employed by petitioner
It is possible for an alien to qualify for the 180-day portability even if she/he had never been employed by the prior petitioning employer or the subsequent employer under AC 21. However, the evidence must be there that an offer of employment must have been bona fide, and the employer must have had the intent at the time the I-140 petition was approved.
Withdrawal/Revocation of I-140
If I-140 is withdrawn or revoked before 180 days, then I-140 petition is no longer valid and cannot be ported to a new employer even after 180 days under AC 21 rule. If I-140 petition is withdrawn after 180 days, the employee can still utilize AC 21. Earlier, in order to substitute the labor certification for another employee, it was necessary to first withdraw previously approved I-140 for a previous employee. However, since July 2007, labor certification substitution is not allowed, employers have little reason to withdraw I-140 petition.
If the I-140 is withdrawn by previous employer but the beneficiary has failed to file evidence of a new qualifying employer before that time, USCIS must issue Notice of Intent to Deny (NOID) I-485. If the qualifying new employment is then timely submitted, USCIS may consider the approved I-140 valid for the purpose of continuous adjudication of I-485 even after the Notice to Deny has been issued. It is thus critically important that people either file the change of employer as soon as the employment change takes place or if the Notice to Deny is received, they respond to such Notice "timely" (within 30 days) and with "required evidence." If the Notice is not timely responded, the USCIS will deny the I-485.
New job eligibility
You can get a new job either using your EAD or having the new employer file your new H1 visa. Consider the pros and cons of EAD/AP vs H1 before deciding which one to use. Even if you have run out of 6 years on your H1 visa, it may be possible to get H1 visa beyond 6 years.
Geographic location
New job does not have to be in the same geographic area but can be anywhere in the US.
New job wages
As long as the wages in new job are at par with job duties and self-supporting that you will not become a "public charge", and as long as the new job duties are similar to the original job, new employer does not have to pay the wages listed in the original labor certification or even the prevailing wages. Wages can be more or less. Wages depend upon a lot of factors such as the job location, company benefits, bonus, current economy etc. Of course, if the wages are so different, USCIS may consider that two jobs are no longer similar and it may potentially create a problem.
Multiple job changes
Even though you can change job multiple times using AC 21, it is not advisable to do so unless absolutely necessary. When the priority dates are backed up a lot, it may be necessary for some people to change jobs multiple times .
Procedure for utilizing AC 21
There are no prescribed forms for utilizing AC 21. When you join a new employer, have them send an employment letter (sample below) with the details that the job is similar to the previous job. In case USCIS issues a Notice Of Intent to Deny (NOID) because they didn't have a chance to look at the previous employment letter yet, send another employment letter at that time, within 30 days.
Changes with the same employer
You should consider utilizing AC 21 provisions if
your job location changes to a different geographical location as the original labor certification was for a particular job location.
your job duties changes as long as new job duties are similar to previous job duties.
your salary changes, increases or decreases.
Priority date
When utilizing AC 21 provisions, the priority date does not have to be current, as long as all other conditions are met as described above.
Changing Employer Using AC 21 Portability Rule
Effective October 17, 2000, The American Competitiveness in the Twenty-First Century Act, (AC21) provides that approved I-140 petition for employment based green card would remain valid even when an alien changes jobs, if:
Employment based Adjustment of Status(I-485) has been filed and remained unadjudicated (pending) for 180 days or more; and
the new job is in the same or similar occupational classification as the job for which the certification or approval was initially made.
If an alien has complied with the above statutory requirements, adjudicators shall not deny applications for adjustment of status on the basis that the alien has changed jobs. Under present practices it is expected that an I-485 applicant notify the USCIS service center when they no longer intend to enter into employment with the employer who sponsored them on the I-140 petition. USCIS would continue to expect the applicant to submit a letter notifying USCIS of this change in intent. If the Adjudicator has reason to believe that the applicant's intent has changed, a Request For Evidence(RFE) may be issued to clarify the applicant's intent in regards to employment.
In instance where the applicant no longer intends to be employed by the employer who sponsored him/her on the I-140, the USCIS would request a letter of employment from the new employer. The letter from the new employer verifying that the job offer exists should contain the new job title, job deion and salary. This information is necessary to determine whether the new job is in the same or similar occupation and to determine whether the alien is admissible under the public charge ground of inadmissibility.
Similar job
What exactly 'similar' means is not very clear and it is subjective. To determine whether a new job is in the same or similar occupational classification as the original job for which the certification or approval was initially made, the adjudicating offer would consult the Department of Labor's Dictionary of Occupational Titles or its online O*NET classification system or similar publications. But these sources are somewhat vague in defining jobs, especially so in the IT industry. The DOT is quite outdated that and it contains no definitions for many IT jobs such as System Administrator. So, safest thing is to change jobs whose title and deion almost exactly matches the job under which the green card was originally filed. Even if the job title is not the same, as long as the job duties are the same or similar, you are fine. e.g., if you were .NET programmer earlier and if you accepted a job in Java programming now, your job duties are still essentially the same. You are still a programmer, and not a cook.
Counting days
180 days start from the receipt date of I-485 and not the notice date. In other words, the date when USCIS received your application, and not the date when they printed a receipt.
Pending I-140
AC 21 rule states that green card application would remain valid if the applicant changes employer after 180 days of I-485. When I-485 is filed concurrently with I-140, and it has been more than 6 months since I-140 is pending, and if the employee changes the employer, as long as the I-140 gets eventually approved, applicant can stilly utilize AC 21.
Intent
In employment based I-485 application, I-140 petitioning employer is required to maintain its intent to employ the petitioned employee upon approval of I-485. In case an employee changes the employer under AC 21 rule, new employer should retain such intent to employ the I-485 applicant for indefinite duration once I-485 is granted. Also, an employee should retain his/her intent to work indefinitely for the new employer at the time he/she takes new employment and through out the period of employment with new employer. If either employer or employee abandons such intent, USCIS may deny I-485 application and once granted, theoretically, USCIS might be able to revisit the adjudication of I-485 and initiate revocation processing.
Never employed by petitioner
It is possible for an alien to qualify for the 180-day portability even if she/he had never been employed by the prior petitioning employer or the subsequent employer under AC 21. However, the evidence must be there that an offer of employment must have been bona fide, and the employer must have had the intent at the time the I-140 petition was approved.
Withdrawal/Revocation of I-140
If I-140 is withdrawn or revoked before 180 days, then I-140 petition is no longer valid and cannot be ported to a new employer even after 180 days under AC 21 rule. If I-140 petition is withdrawn after 180 days, the employee can still utilize AC 21. Earlier, in order to substitute the labor certification for another employee, it was necessary to first withdraw previously approved I-140 for a previous employee. However, since July 2007, labor certification substitution is not allowed, employers have little reason to withdraw I-140 petition.
If the I-140 is withdrawn by previous employer but the beneficiary has failed to file evidence of a new qualifying employer before that time, USCIS must issue Notice of Intent to Deny (NOID) I-485. If the qualifying new employment is then timely submitted, USCIS may consider the approved I-140 valid for the purpose of continuous adjudication of I-485 even after the Notice to Deny has been issued. It is thus critically important that people either file the change of employer as soon as the employment change takes place or if the Notice to Deny is received, they respond to such Notice "timely" (within 30 days) and with "required evidence." If the Notice is not timely responded, the USCIS will deny the I-485.
New job eligibility
You can get a new job either using your EAD or having the new employer file your new H1 visa. Consider the pros and cons of EAD/AP vs H1 before deciding which one to use. Even if you have run out of 6 years on your H1 visa, it may be possible to get H1 visa beyond 6 years.
Geographic location
New job does not have to be in the same geographic area but can be anywhere in the US.
New job wages
As long as the wages in new job are at par with job duties and self-supporting that you will not become a "public charge", and as long as the new job duties are similar to the original job, new employer does not have to pay the wages listed in the original labor certification or even the prevailing wages. Wages can be more or less. Wages depend upon a lot of factors such as the job location, company benefits, bonus, current economy etc. Of course, if the wages are so different, USCIS may consider that two jobs are no longer similar and it may potentially create a problem.
Multiple job changes
Even though you can change job multiple times using AC 21, it is not advisable to do so unless absolutely necessary. When the priority dates are backed up a lot, it may be necessary for some people to change jobs multiple times .
Procedure for utilizing AC 21
There are no prescribed forms for utilizing AC 21. When you join a new employer, have them send an employment letter (sample below) with the details that the job is similar to the previous job. In case USCIS issues a Notice Of Intent to Deny (NOID) because they didn't have a chance to look at the previous employment letter yet, send another employment letter at that time, within 30 days.
Changes with the same employer
You should consider utilizing AC 21 provisions if
your job location changes to a different geographical location as the original labor certification was for a particular job location.
your job duties changes as long as new job duties are similar to previous job duties.
your salary changes, increases or decreases.
Priority date
When utilizing AC 21 provisions, the priority date does not have to be current, as long as all other conditions are met as described above.
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