Q: Is there a process for ISVs to transfer offers to another Seller ID if they sell these offers to another company? I sold my offers from company A and would like to transfer the ownership of the offers to the new owner, company B.
A: Offer reparenting (from one seller Id to another) is not supported as of today.
As a work around, you can raise a support ticket under "User and role management > Update Marketplace owner". Depending upon the company's state, maybe Company B's user can be added as an owner to Company A's seller account.