Thanks for joining this thread, @mgiampietro.

I can share some insights about the AP reports (AP aging detail, Bill payments list, Unpaid Bills and Vendor Balance Summary) in QuickBooks Online.

The reports you've mentioned are for the vendor's account and therefore don't have the customer fields.

You can pull up a different report and customize it to show the customers. However, this is only possible if you tagged the expense transaction as billable. Let's run and customize the Purchases by Vendor Detail report.

1. Click Reports.
2. On the search field, enter Purchases by Vendor Detail.
3. Click the Report's setting option.
4. Put a check mark on the Customer box.
5. Update the date period.
6. Click Run report.

For more customization guide, please refer to this article: How to customize reports.

That should give you the report you need, mgiampietro. If you have more AP report questions, just add a comment or mention my name. I'm still here to offer my assistance.