Welcome, lankfordcabins.

Let me explain how invoicing works in QuickBooks Online.

You can follow the workaround shared by BettyJaneB. We can create a new invoice by copying the data from the old ones. You can run the Open Invoices report as your reference. Simply go to the Reports tab, then search and select Open Invoices.

I know this has been forwarded, I'll send another one to our developers. The more feedback, the bigger the chance this will be implemented.

You can let your customers pay their invoices online. This is very useful to save time and most convenient. You can check this guide to learn more: How to let customers pay their invoices online.

Please comment again if you have more clarifications. I'll be happy to help.