Hello, @LMKetchum.

For the time being, the option to show customers (or a Customer column) on aged payable reports, like A/P Aging Detail and A/P Aging Summary reports, is unavailable in QuickBooks Online (QBO). Let's pull up the Unbilled Charges report instead to get the data you need.

By default, the Unbilled Charges report will only show you the list of your billable expenses. To add the customer associated with each of the charges, you'll have to set the Group by feature to the Customer option and to set the appropriate report period. Please see the screenshot below for your reference.

Also, you can opt to save your report's current customization settings to be available for future use. You may want to check out this article to learn more about this process in QBO: Memorize reports in QuickBooks Online.

Please don't hesitate to let me know in the comments if you have other reporting concerns in QBO. I'm always ready to help. Take care, and I wish you continued success, @LMKetchum.