Thanks for reaching out in the Community and providing a screenshot about your concern, @Nessy Learning.
At this time, having the invoice number to automatically fill in in the Reference no. field when receiving a payment for the invoice in QuickBooks Online (QBO) is unavailable.
I can see how the feature you're looking for would benefit and empower your business. In the meantime, I recommend sending this request straight to our product engineers through feedback.
In case you'd want to see a snapshot of your business, you can check this article for an overview of how to run basic reports: Run reports in QuickBooks Online. And if you need help customizing your reports, you can check this article for information: Customize reports in QuickBooks Online.
If you have other concerns and questions about managing your QBO account, I'm always around to help. Take care, and I wish you continued success.
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