NOTE: The Duplicate option is not available in Sage 50 Accounts Essentials. 

1. On the navigation bar, click Invoices and credits.
2. Locate and click the invoice you want to copy, then click Duplicate. To create a credit note based on the selected invoice, click Credit invoice.
   
   

   TIP: If your Sage window's maximised, the Duplicate button is at the top next to Recurring items. If you don't have the window maximised or wide enough, click the drop down arrow underneath the New/edit button for the Duplicate button. Or, you can right click on the relevant invoice / credit note and click Duplicate.

3.  

   Make any required changes to the invoice, then click Save.

Watch a video