Defining Calculation Columns
Open an application report or a tabular section report in RDA.
Select the tabular section in which you need to add calculation columns.
Insert a data dictionary field or a numeric variable to hold the calculated value.
Drag the field to the appropriate location.
Change the name of the column heading and variable to reflect the purpose of the calculation.
Click the newly created column.
From the Column menu, select Define Calculation.
On the Expression Manager form, define the calculation by performing these actions, and click OK:
Double-click fields from the Available Information list.
Click the appropriate calculator functions to build the expression.