Yes, it can be done. But you will need to define the specific responsibilities appropriately. For example, if the Manufacturer B physically manufactures the product for the Manufacturer A, then the Manufacturer B shall be listed as "Contract Manufacturer" for that specific product and the Manufacturer A shall also declare its role accordingly. Both A and B shall also link the original 510(k) of that product to their listing.Can the foreign manufacturer A register additional products using 510(k) of another foreign manufacturer B.