I have filed GC in EB2 category, but I am getting good opportunity in some big MNC and they can not continue my current EB2, but they can file new application in EB3.
So what's procedure for it? Is it possible in future If get some opportunity then can I come back to EB2 again from EB3?
Yes, in theory you can have two different application pending.
Talk to the immigration lawyer(s) working with both of these companies ... they need to be fully informed as to what's going on.
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If the I-140 based on the EB-2 was approved, you will be able to capture the priority date for the EB-3. If you go back to an EB-2, the same will apply.
I would consult with a business immigration attorney to review your matter. This would be my best advise in your case.