do I have to switch to H1 before apply I-140

sidhu70

Registered Users (C)
Hi
I am on L-1B, visa and my company is sponsoring me for GC. My lawyer advised me that after my PERM is approved, I have to switch to H1 before we can apply for I-140, Can some please kindly advise me is it must to change my status to H1 before apply for I-140. If i do change, my wife can't work.
thanks
 
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