Discount schedules are tables used to reference how students’ classes should be ordered, how much should be discounted (multiple class and/or multiple student discounts) and if any Special Discounts apply to classes.

When determining this, ALL class enrollments for a student are counted (across all programs) and then ordered (from most expensive to least expensive). However, only classes which are set up to use discounts and have a discount schedule attached to them will be discounted.

click the link for details – https://support.iclasspro.com/hc/en-us/articles/218569368-How-to-Set-Up-Discounts