I would like a button that copies invoices into an estimate.
I know it seems backwards to most, but it would be useful in many situations for me.
Welcome to the Community, simotors.
I can share some information about creating estimates and invoices in QuickBooks Desktop.
While converting an estimate to an invoice is possible, changing it back isn't currently available in QuickBooks Desktop. You will first need to create an estimate then convert into an invoice or, to sales order and then invoice.
Create an estimate:
Convert an estimate to an invoice:
Convert an estimate to a sales order:
You can get more details in this article: https://quickbooks.intuit.com/community/Income-and-expenses/Create-an-invoice-in-QuickBooks-Desktop/....
Should you have other concerns about estimates and invoices in QuickBooks Desktop please let me know. Have a good one.