I appreciate you for getting back to this thread, @moorhen.
We can pull up the Transaction List by Customer report to show the balances left on open credit notes and invoices.
To do this, here's what we need to do:
- In your QBO account, go to the Reports menu.
- Search for Transaction List by Customer statement in the Find report by name field.
- Click the Customize button.
- Choose the date under the Report period section.
- Under Rows/Columns, put a checkmark next to Transaction Type and Open Balance.

- Select the Transaction Type box under Filter and select Invoices and Credit Memo.
- Once done, click Run report.
You can also open this resource to help you add more filters to your report: Personalized reports in QuickBooks Online. It also covers some steps on how to save custom statements.
Additionally, I've attached this link that provides some common custom reports in QBO. It has few ways on how you can customise reports to fit your specific needs.
Keep in touch if you have further questions about generating reports in QuickBooks. I'll be happy to lend a hand.
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