Creating calculations
 In the Database Structure, expand the hierarchy on which to create a calculation to show the Calculations folder.

Rightclick the Calculations folder and select New Calculation.
Note: The Calculations folder is displayed only if Show Calculations is selected in the settings of the Database Structure pane.
 Click the calculation.
 To create the calculation, doubleclick elements and combine them with standard arithmetical operators. A number of functions are available from the Functions button. Place the cursor in the calculation at the point at which to insert a function and then doubleclick the function.