請教小白兔 please help, I've been waiting for you...

I’m in company A. My H-1 will expire in July. Company B just filed an H-1 transfer for me. I don't want to take the new job and want to stay with company A

My questions fro you are:

1. Can company A file my H-1 extension while there is a pending H-1 transfer by company B?
2. Does company B have to cancel the transfer before the extension by company A is possible?
3. What are my options?

Thank you very much and looking forward to your responses! I would appreciate if you can provide me some useful link on this two.