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如果選option B，H1B transfer 成了會自動延期三年嗎？

-You need to ask your new employer to file the H_1 petition for you for another three years (indicate the start date and ending date in the I-129).  You also provide the copy of the I-140 approval notice to the new employer and ask the employer to enclose it with the I-129 filing. Thus, USCIS will approve the H-1 petition for another three years beyond your 6-year H-1 limit using the I-140 approval notice.

我可不可以不辭職，先讓新公司做H1B transfer，批準後再從現公司辭職呢？

-Yes.