This is a great idea, ann22.
Adding notes to products for internal use is unavailable. I'll surely send this feedback to our product developers. We gather data about features the customers needs the most and do our best to include it on the next updates.
You can check the QuickBooks Blog for product and feature updates: What’s new in QuickBooks Online.
Here are some article for future reference:
If you have other questions about QuickBooks, don't hesitate to leave a reply.
