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Thanks for posting here, @Guy W.

Let's customise the Commercial Invoice template to prevent this from showing as Sales and a Debtor. Here's how:

1. Click the Gear icon and choose Custom form styles.
2. Look for your Commercial Invoice template and select Edit. 
3. Go to the Content tab and click the section you'll need to modify.
4. Tick Done when finished. 

To know more details about the process, please visit this article: Customise invoices, estimates, and sales receipts in QuickBooks Online.

Also, to get a list of all payments and invoices for each of your customers, you may pull up the Invoices and Received Payments Report. Then, customize it so it will only show the info you need.  

Let me know by leaving a comment below if you need further assistance with managing your invoices. I'm always here to help. Have a good one.