H1B Extension through company B approved PERM

[SatyabrataSahoo]

Hi ,

I'm currently with Company A and my H1B will be expiring on July 19th 2017. I received my PERM approval as future employee though company B.

1. Can I file my H1B extension through company B PERM approval through AC21 Portability?

2. Can I file my H1B extension without changing job from company A to Company B?

 

Thanks 

Satyabrata