Welcome back to the Community, @ccf2.

Yes, you can only have one income account per product or service item in QuickBooks Online (QBO). This way, you can keep your income transactions organised and track them accordingly.

Whenever you're ready to add a new product or service item in QBO, you can refer to this article for the complete guide: Add product and service items to QuickBooks Online.

Also, you can use reports to get helpful insights on the things you buy and sell and the status of your inventory in QBO. You may want to check out this article as your reference to know which one to run depending on what kind of info you want to see: Use reports to see your sales and inventory status.

Let me know if you have other concerns about managing items and income transactions in QBO. I'm always here to help. Take care, and I wish you continued success, @ccf2.