Your nonimmigrant status has nothing to do with whether or when to file PERM. Some PERM are filed for aliens that have never been to US.
The approved I-140, if not revoked, can be used to extend your H1 beyond 6 years, even it's from another sponsor.
The approved I-140, if not revoked, can be used to extend your H1 beyond 6 years, even it's from another sponsor.