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Hi there, @craigjbradley.
It looks like this is a duplicate post. Let me link you to the original thread where answered by my colleague, Steve_C.
I've also added screenshots for you.
For additional reference, you can check these articles below:
Customize invoices, estimates, and sales receipts in QuickBooks Online
Add, customize, or remove logos on sales forms
Also, we can customize import templates. Here's an article you can read to learn more about importing your invoice template: Importing Custom Invoice Templates into QuickBooks Online.
You can mention my name if you need more help with customizing templates. I'll be always around to help. Have a great day!