Hello there, MachineWorks504.

Let me share details about creating an invoice from multiple estimates in QuickBooks Desktop. This way, you'll be able to determine how to manage your transactions and keep your account updated.

Creating an invoice from multiple estimates is currently unavailable in QuickBooks Desktop. However, you're on the right track in turning the estimate (100) into an invoice and manually copying all the information from the other one (101) in the second line. Then, add your notes to track them properly.

Estimates are non-posting sales transactions. This means they don't affect your accounts in any way unless converted into an invoice. 

Additionally, you'll have to create an invoice to help track your accounts receivable. If you wish to learn more about how to create them in different ways, kindly refer to this article: Create an invoice in QuickBooks Desktop.

Please let me know if you have other concerns. I'm just around to help.