Hey Gerald 6,

Thank you for reaching out to the QuickBooks Community. I was able to pull up my test account to verify this. You are correct in saying that the product would need to be set as an inventory to get COGS, gross margins, and gross margin % in the Sales by Product/Service Summary Report. If you ever need to customize a report, this article is very resourceful.

Please do hesitate to let me know if you have questions. I will be here to assist. I hope you have a lovely day!