Actually, I have some experience as Amazon Seller/FBA. I believe on certain items, I would get an option to co-mingle it. It wasn't selected by default, so I di

Actually, I have some experience as Amazon Seller/FBA. I believe on certain items, I would get an option to co-mingle it. It wasn't selected by default, so I didn't change it. So Amazon has already built the system to keep inventory separate by sellers.