What are Discount Schedule types in CPQ and what is the difference between slab and range?

Discount Schedules (SBQQ__DiscountSchedule__c) apply automatic volume or tiered discounts to quote lines based on quantity or amount. Schedule types:

1. Slab: The discount for the highest applicable tier applies to the entire quantity. Example: 1–10 units = 0%, 11–50 units = 10%, 51+ units = 20%. If a rep quotes 60 units, the entire quantity gets 20% discount.
2. Range: Each tier's discount applies only to the quantity within that tier (like progressive tax brackets). For 60 units: the first 10 get 0%, next 40 get 10%, final 10 get 20%. The blended effective discount is lower than slab. Pricing method for discount schedules:
3. Additive: The discount is added on top of any existing manual discount on the line.
4. Exclusive: The schedule discount replaces any existing discount. Discount schedules are associated with products or price book entries and are evaluated as part of the Customer Price step in the pricing waterfall.