I have mutiple employer filing H1b during my grace period. Say B and C. If both files and if I want to join C can I join C .

You can join C if you prefer since its H1B petition was filed within the 60 day grace period of employment termination with A.

AP/EAD Travel with valid H1b status (Not stamped H1b Visa)

Yes, it is possible to extend H1B status within the U.S. even if entry is made with combo EAD/AP card, but this possibility is foreclosed if...

What will USCIS do with the pending H-1b cases after their OPT got expired?

You must discontinue working when OPT expires since you are not covered under cap gap. H1B petition will not be "ignored"--it will either be...

Since there is no requirement to maintain underlying H1B status with a pending I-485, and employment is authorized only with EAD or valid...

H1B transfer on a Master's degree - any rule around level of job?

A specialty occupation would be a position that requires a specific bachelor's or above degree to perform the job. The H1B petition can be approved...

Does my F1 become void once my i140 is approved? What happens to my dependents who are on F2?

It is still possible to maintain F1/F2 status with I-140 approval. Consult with an immigration attorney prior to traveling abroad.

240 days rule?

Yes, legal to work for 240 days based on timely filed H1B extension petition, and still in a period of authorized stay in the U.S. beyond that but...

I-797 approval notice received date and validity dates determine if USCIS properly receipted the application in its system at inception to preclude...

When is best time to leave your employer in GC processing?

Some questions that will be asked by an immigration lawyer before responding: whether and when I-140 has been approved; when was I-485 filed;...

Can I stay beyond 240 days in case not received approval for my Amendment ( client/location change ) ? ?

The filing of an H1B amendment by your employer will allow you to change location. Regarding H1B extension petition filed by the employer, the 240...