Can I create an A/R Aging report that shows the classes for each outstanding invoice?

So happy you joined us here in the Community, @lyonski2!

Being able to create an Accounts Receivable Aging report and show the class assigned to each outstanding invoice would be helpful. Currently, this option is unavailable. I encourage you to add your vote for this one by sending a feature request in the Feedback section within QuickBooks. Our product development team reviews all the feedback we receive to ensure we’re meeting the needs of our customers.

Here's how:
 

1. Select the Gear icon at the top, then Feedback.
   
2. Enter your comments or product suggestions then select Next.
3. You'll be provided a list of suggested Help articles related to your comment. You can read through them or select Skip and send message.
4. From the drop-down, choose the appropriate category, then select Send message.

For your reference, check out this link: How to Submit Feedback.

In the meantime, you'll want to export both A/R Aging Detail and Sales by Class Detail reports to Excel. Then, use the information to get your desired result. 

Feel free to swing by any time you need help customizing your reports. It's always our pleasure to assist. Have a wonderful day, @lyonski2!