When you calculate a pre-calculation in MONITOR, it will take the terms that you configure during Preparation into account. Under the Create tab in the Pre-Calculation Selection, one term is shown by default and that is the Quantity term (via the field Quantity if EOQ is missing). If you have selected to use alternate preparation in the Settings procedure, you will also see the terms Period, Order number, Customer code and Alternate preparation code under the Create tab. That will allow you to take these terms into consideration during pre-calculations.
The calculation will be calculated according to the terms that have been entered. The terms that have been entered throughout the entire structure will be applied to the Quantity if EOQ is Missing and Period fields. In other words, there will be no breakdown of the Quantity or Period fields for the underlying levels in the structure.