You can apply discounts to your invoice, however, you need to enable this feature first before to start getting benefit from this feature.
Follow the simple steps to enable invoice discount for your invoices.
1- Click on the Settings Module.
2- Select Company from the settings list.
3- In the Company page, Choose Discount Item to apply a discount to each invoice line item or to selected item of your invoice.
4- Click Save.
Discount Items
A Discount column will display on the invoice and estimate table.