A product was created with "0" cost. after 20 days, I added a bill for that product, but still cost of that product is "0". Why I have to change Purchasing info manually?

Hey there info-canolight-c,

Welcome to the QuickBooks Community! Thanks for reaching out to us here. QuickBooks online is a great too able to help keep your books balanced. I would be happy to provide some information.

QuickBooks Online gives you the option to add the cost of product/services when you create an item. To add the cost, you can head to the Gear icon and select Products/services. Next, find the item and click on Edit. From this section, you'll be able to add the cost of the item. By adding a cost, it will automatically be applied to all your forms by default. In addition, here is a helpful guide for your reference about adding products/services to QuickBooks Online. Scroll down until you see Edit a product/service. I hope this helps!

If you have any other questions, feel free to reach out to us here.