You can set up automatic discounts for orders meeting specified criteria. To do so:
In the Service Panel, go to Materials, click on one of your listed materials and choose Discount in the sub menu.
Click Add Discount Rule
Select the discount condition from the menu
Define the discount type: Fixed or Percentage
Set the desired value as Amount for fixed or Rate for percentage.
After inputting all the required information → Click on Add Discount Rule
Note: You can either adjust the discount by clicking the pen icon to the right (changing it Will Not Work Retroactively on already placed orders) or delete it altogether by clicking on the trash bin icon.