Hello there, accounts9.
Thanks for letting us know what you're trying to accomplish.
Great news! There is definitely an available report in QuickBooks Online (QBO) that shows a total amount of your unpaid bills, grouped by days past due.
Let's run the Accounts Payable Aging Summary report and customize your preferred date for the aging period.
I've also attached some screenshots below as your visual guide.
There you have it. Drop me a reply below if there's anything else you need or questions about vendor reports in QBO. It's always our pleasure to help.