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Hi there, @useremilee.
Thank you for adding a post here on the Community page. I'm here to guide you on how to review your outstanding bills for a project in QuickBooks Online (QBO).
You might not be able to open a report for your outstanding bills that were linked to a project, but you can check for the transaction from the Projects page itself.
If you want to print the entries, tap on the print icon or the export icon to export the transactions to Excel.
For additional reference about tracking and organizing your projects in QBO, check out this link: Set up and create projects in QuickBooks Online.
Lastly, here's an article you can read more about running and customizing reports: Run reports in QuickBooks Online.
If you have any other questions, feel free to mention my name in the comment section below. I'm always here to help. Have a good day!