Which report is the best report to export unpaid bills, to be imported into a new version of QBO?

Hi there, 

Thanks for posting in the Community. I'll be happy to share more info about creating and exporting reports in QBO. 

QuickBooks Online has an Unpaid bills report that shows you outstanding bills in the program. Based on what you've described, this is the report I recommend you use. To find this report, follow the steps below: 

1. Go to Reports at the left pane.
2. Look for Unpaid Bills.
3. Make sure the info you're looking for in present.
4.  From here you can print and export the report.

Give this a try and let me know how you make out. If you need further assistance, feel free to contact our support team using this link here.