Thank you for posting here on the Community page, @HAM9.

Let me share some information about managing invoice templates in QuickBooks Online.

Updating a message from one of your template will update the message on all of the templates from the Custom Form Styles window. If you want to print or email your invoices in the future, you can also read the topics from this article as your guides. Post again if there's anything you need assistance with. I'm a few clicks away to help. Keep safe always!