Use calculation groups to define:
The formulas that are used to calculate the estimate line quantities for activities in the work breakdown structure.
The models with the default formulas for each transaction type.
The setup that is required for progress billing: a variable that is marked as scheduled unit. For progress billing, usually, the scheduled unit variable is a percentage.
The setup that is required for subcontracting: a variable that is marked as scheduled unit and for which the unit is defined as well. Reason: Subcontracting uses purchase orders, and on the purchase lines a unit is required.
A cost price (expense) or sales price (expense) for a specific scheduled unit.