Googly Google

Hello,

I work for company A, company B filed for my labor in March 2004 as a
future employee because company A was not filling for my green card.
Now company A has decided to file for my labor. My labor certification
application with company B just got approved.

My question was:

1. Can I use the Priority date of approved labor from company B for my
new labor application throught company A ?

2 Does I-140 need to be approved from company B before using that
priority date for the labor at company A.

3. At what stage can I use that priority date ( PERM Labor application,
I-140 or I-485) ?

4. Will company B find out if I use that PD for my new labor ?

Any help is appreciated.

Thanks.