Hello there, oceanbeachesglass.
For now, we're unable to pull up a report that will show the total quantity of items sold per category.
You can share your idea to our product developers. This way, we'll know what our customers want. You can do that by clicking on the Gear icon, then choosing Feedback. Requests entered there will be considered for inclusion in future updates.
We'd love to hear from you soon. You can always drop by the Community if you need help with the system.