I-140 approved through Co. A can be used to extend H1B status beyond 6 years in the future through any employer even if revoked by the employer...

H1 to H4

Another company can file an H1B petition for her requesting change of status from H4 to H1B and it would be exempt from the visa cap. She would...

Yes, if these purchases are for personal use and not on behalf of a business that you represent or operate unless you have EAD.

There should be an intention to work for the sponsoring employer when you receive your green card. You can work in the meantime with this employer...

Is my B2 visa valid? can i use it to arrive at port of entry and seek admission?

The visa should continue to be valid until expiration--you departed the U.S. before the USCIS made a final decision on a timely filed non-frivolous...

Would additional income from other sources hurt my Permanent Resident status while I am holding employment based green card?

It will not because you are still also working in the area of national interest through which your I-140 petition was approved for a reasonable...

Selected as the best answer

Her status is OK if, prior to her I-797 (H4 approval notice) with validity date of 12/02/18, her I-94 expired no earlier than 12/01/18.

Re-enter US on H1b after a short vacation to Mexico.

Upon your return to the U.S. show the latest I-797 at the port-of-entry. You should be issued an I-94 with a validity date that matches the I-797...

Employer change while RFE in LCA is open.

Another company can file an H1B petition for you and it will be approved on its merits irrespective of an open RFE or revocation of H1B petition...

How soon after I divorce should I file form I-751 and evidence?

File during the 90 day window prior to expiration date stated on the conditional resident card, but it is acceptable to file prior to that window...