Problem: How to add Discount to Customer Order / Invoice?
Solution: Use discount type settings as shown.
1. Go to Discount Types - Sales > See also > Discount and Markup Types:
2. Create a new discount type, press Save and close:
3. In the Customer Order, select the needful discount type at Main tab:
4. Refill prices option enabling will be demanded if you want to apply a discount to an already posted Customer Order.
NOTE If you enable the Refill Prices option, you need to enter Prices again.
For automatic discounts setup, please refer to the link 3.3.2. Automatic Discounts and Markups
3.3.3. Automatic Discount Conditions
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