You can use the Stock Keeping Unit (SKU) feature in QuickBooks Online (QBO) to help track your inventory items.
- In your QBO account, go to the Gear icon at the top to go to Products and services.
- Click on Edit an existing item or select New on the upper-right.
- Enter the SKU.
- Hit Save and close.
To learn more about managing inventory in QuickBooks Online (QBO), check out this article: Add inventory products.
You can also run reports to keep track of your inventory. See this article for more information: Use reports to see your sales and inventory status.