run a customer balance report for a specific customer only ?

You can filter the Customer Balance Detail report for only one customer, @57882bed.

Follow the steps below to use the filter of a report to show only the transactions for one customer:

1. From the left menu, hover your mouse over Reports and choose Standard reports.
2. Enter Customer Balance Detail in the search box.
3. Select the date range.
4. Click the Filter button at the upper right of the screen.
5. Choose Customer from the first box.
6. Select equals in the second box and the name of the customer in the third box.
   
   
    

Your report should now show all the transactions within the chosen period for a specific customer.

You might want to explore working with QuickBooks Live Expert Assisted services. They can offer guidance on navigating and tailoring reports within QuickBooks Online.

Don't hesitate to comment below if you have additional questions about managing your reports.