1) My wife is currently on H-1B. I am also on H-1B with approved I-140. My wife's employer is willing to Start GC process for her. I understand that GC is for future employment.<br>

My wife is willing to Move to H-4 EAD. Say my wife's employer initiated her GC process when she is on H-1. Once the perm is filed by wife's employer, will she be able to convert from H-1 to H-4 EAD. Does this has any affect on her ongoing GC process. Is it safe for some one to changes status from H-4 to H-1 and H-1 to H-4 in between PERM and I-140 process.<br>

2) My brother is on F-1 in OPT status. Can my brother's employer start GC process for him while he is on OPT. I have some knowledge of the complications involved in Starting GC process on F-1. The main reason behind this question is to reserve a spot for GC process. That way my brother can get a earliest priority date, his employer would start GC process 2 years down the road when he is on H-1B.
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What is the safe route for some one like my brother to get a earliest priority. Do they have to wait till H-1B to get in to GC process Queue

I have my perm labor and I-140 approved through EMPLOYER A (Consulting Firm). Priority Date June 2013. If I am going to change Employer, EMPLOYER A is going to REVOKE MY I-140. I heard from your last conference call that i will be loosing my priority if I-140 is revoked by employer.I am close to 5th year of H-1. so cant take chances. If I move to FT position in the next 6 months and say my current employer revokes I-140. I will not be able to get extension for H-1 beyond 6 years.

I saw some online forums stating that if I-140 withdrawn you can retain your PD date. Is it true under current circumstances? What is difference between I-140 Withdraw vs I-140 Revoke? If both are not the same, in which cases employers to for withdraw.