You can choose to associate fees or discounts in either fixed amounts or percentages for all add-on types.
Enter the price adjustment as a positive value, such as 2.50. To add a discount, enter the price adjustment as a negative value, such as -2.50.
When setting the price adjustment as a percentage, the adjustment will be calculated based on the order’s subtotal.
For the Text, Text Area, and File add-on types, you can set the price adjustment on the General tab:

For all other add-on types, price adjustments can be set on the Options tab:

											  Article ID: 1809
											  Created On: Wed, May 12, 2021 at 4:53 PM
											  Last Updated On: Wed, May 12, 2021 at 4:53 PM
											  
											
Online URL: https://www.heartinternet.uk/support/article/about-price-adjustments-with-checkout-add-ons.html