A client has multiple invoices for different activity costs and you want to merge these costs into the one invoice. Then do the following:
1. Go to Main Menu, select Payments then Invoices.
2. If the invoices haven't been issued they will be in the Draft tab
3. For invoices that are issued go to the Issued tab
4. Enter the client's name in the Search bar
5. Select by ticking the invoices you want to merge and then select Merge Invoice
6. The Merge Invoice window will be displayed. All the Invoice items that are contained in both invoices will be displayed. Using the drop down list reassign the items to the targeted invoice.
7. If the Invoice has been merged from the Draft tab it will be moved to the Issued tab