Quickbooks Online - A/R Aging Summary Report showing deleted customers with balances as "-" or dashes

I have some suggestions on how to exclude deleted customers from your A/R Aging Summary Report, @Londonct3.

While there is no direct way to remove deleted customers from the A/R Aging Summary Report, you can customize the report to include specific customers. 

1. Go to the Reports in the main menu.
2. Locate the A/R Aging Summary Report in the Who owes you Section.
3. Click the Customize button at the top right of your screen.
4. Enter the correct reporting period, then click the Filter dropdown.
5. Hit the checkbox under the Customer area, then checkmark all customers you want to include in the Specified dropdown. 
   
   I've included a screenshot below for your reference:
   
   
   
   
6. Once done, choose Run Report.
   
   

Alternatively, you can export your A/R Aging report to Excel and remove deleted customers to exclude them.

You can also read this article for the complete details: Customize reports in QuickBooks Online.

I've also included some useful articles that guide how to run and manage reports in QBO:

• Run reports in QuickBooks Online
• Memorize reports in QuickBooks Online

You can always drop by here if you need help while running and customizing reports in QuickBooks Online. My team and I are always around to help.