Manage product variants and stock
Give each sellable combination a clear price and stock level, and retain traceable inventory movements.
When to use a variant
A shirt in two colors and three sizes has six possible combinations. Activate only combinations you can actually sell. Give each its SKU, price and stock; do not put price differences only in descriptive text.
Update stock through real operations
Receiving goods, selling, cancellation and returns have different effects. Check open orders and reservations before manually adjusting stock. For a returned item, distinguish physical receipt from whether it can be sold again.
Test before publishing
Switch colors and sizes in the buyer preview. Price, photo and availability should follow the selection. An unavailable combination must not become purchasable by selecting another variant. Report issues with the product URL and selected combination.