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:
Update a single variant
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.
Update all variants
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.