I currently have my inventory automatically pulling from my POS system and it is working great. But I have a few items that I do NOT keep in inventory that I would like to Manually add to my store. When I add them manually through Shopify with qty they disappear after my POS system does a sync. I am assuming that the lines don't match the rules from my POS sync to Shopify so it deletes them. Is there a way to add these items without them interfering with my sync setup?