If you would like to add a discount to an invoice (either to reflect a pre-payment already received or you are just wanting to be nice and discount your price) then you simply need to add a new invoice line with a negative amount associated to it and the system will automatically reduce the total amount on the invoice.
- Add Line, and click the edit icon to the right of the Service, you will be able to manually edit the text to show the discount reason.
- For the price, you can manually edit it to add a negative amount e.g. -200.00
This is an example of what the invoice would look like;