Sage 50 allows you to create a new sales invoice by copying an existing one.
To copy a sales invoice from the Sales/Invoicing screen:
Only the following information from the original invoice will be copied to the new invoice:
Note: If the original invoice contains serialized items, the serial numbers will not be copied. (Sage 50 Premium Accounting and higher)
If the original invoice has attachments, the attachments are not copied.
Information on the Track It panel is not copied. (Sage 50 Quantum Accounting)