Hello, @info427.
I'm happy to guide you today so you'll be able to enter the costs of your products in QuickBooks Online successfully.
To add the products' cost, you can simply go to the Products and Services window.
- Click on Products and Services under Lists from the Gear icon.
- Look for the products from the result, then click on Edit under Action.
- Scroll down at the bottom of the page, then add the cost of the product/item under the Cost section.
- Tap on the Save and close button to record the changes.
- Follow the steps for the rest of the items.
For additional reference about the adding products and services in QuickBooks Online, check out this article.
I'm happy to help if you have any other questions. Just add a comment below. Have a good day!