Add variants like size or colour
Sell one product in several versions, each with its own price and stock.
Open the variants manager
On the inventory list, open the product's actions menu (⋮) and tap Variants to open its variants manager.
Add each version
Add a variant for each option — for example Small, Medium, Large, or Red, Blue, Green.
Price the difference
Each variant can carry its own price difference (use a minus amount to make it cheaper) and its own stock count, separate from the main product.
Sell it
Save, and cashiers can pick the exact variant at the till. Each variant's stock goes down on its own when sold.