How do I sell one unique item because it is handmade? I have one product and 13 variations, each a unique one-time item. The dashboards show that I have an excess of inventory when I only have one item. I do not have the same duplicate item. I cannot find a way to sell just one at a time, and I need to create variations of the same product every time.

I haven't been able to create a listing to sell stainless steel tumblers on Amazon because when I try to create the listing it keeps asking me the UN number (a four-digit number that identifies dangerous goods, hazardous substances and articles ) for the safety transportation even when I saw on Internet there It's not necessary to have it, and the factory where I bought it they don't have that information, someone please can help telling me how can I get it or what can I do. Thank you.

I have an item that I have had listed for many years. I switched factory and was forced to create a new model number and upc. I do not want to loose the reviews and ratings. It is the exact item but I want to keep the same listing. I tried doing the edit and add new condition option but that does not let me update the upc. It only allows me to add the new model number. Please help.