An Agreements & Promotions calculation logic calculates line items of an Agreement/Promotion.
Go to Administration > Logics > Agreements & Promotions to create a new one. The basic steps to set up a calculation logic are described in Configure Calculation Logic.
An Agreement/Promotion consists of several line items and each of the line items is represented by an Agreements & Promotions Type. And each Type has an Agreements & Promotions calculation logic assigned to it.
If you need to calculate a summary of the Agreement/Promotion line items, or have special inputs for folders (typically the root folder), then you must use the Agreements & Promotions Header Logics.