How can I run a report in quickbooks online to show unpaid bills or open bills listed by customer?

Thanks for posting in the Community, @SJHD.

Currently, we're unable to run unpaid bills listed by customer reports. Instead you can go to Sales and select the UNBILLED ACTIVITY.

Please follow these steps:

1. Go to Sales and then select All Sales.
2. Choose UNBILLED ACTIVITY column.
3. Then click the Print icon to view or print a copy.
   
   

There you can see customers listed on the unpaid bills.

You can use this article on how to use Run reports. It includes how to run account reports and set up general report preferences.

Should you have questions, leave a message for further help. I'll be happy to assist you. Enjoy your weekend!