If the accounts are meant for different purposes, the inventory needs to stay completely separate too. Don't list the same item on both profiles or reuse photos and descriptions from the personal account on the resale one. Keep your own clothes on the original profile and assign every product purchased for resale to the new account from the start. Use separate inventory records so an item never ends up posted in both places by mistake. That will also make the messages, returns, and sales figures much easier to manage.