To edit the stock levels for a product, click the Save product and edit stock button on the product editing page. The stock levels page is divided into two sections:
This section lets you update the stock level for a single variant. Select the variant from the drop-down fields, enter the stock level, and click the Save button to save the stock level.
This section lets you update the stock level for several variants at once. A table shows all variant combinations and their stock levels. Edit the stock levels and click the Save button to save them.