Open the artwork editor and choose Variants & SKUs. Add an option name such as Canvas / 16 × 20, a unique SKU, a USD price, an optional private cost, and an optional image. Repeat for up to 50 variants, then save.
Costs stay private; collectors choose an option and see its saved price before checkout. Each SKU represents one sellable item, without quantity inventory or automatic restocking. Check every variant image and price as a visitor.
Auctions cannot contain variants; use a single artwork auction instead.