I got EAD from a company B doing my GC in future employee category. Can i use that to work part-time?
Yes, but if EAD used then you will not be on H1 status and will need valid AP to renter US in future
Currently I am on h-1 for company A, which is also sponsoring my gc and am in LC stage.
--- EAD used for full time or part time once EAD is used you will not be on company A H1 status