Creating calculations
- In the Database Structure pane, expand the hierarchy on which to create a calculation to show the Calculations folder.
 - Right-click the Calculations folder and select New Calculation. 
           Note: The Calculations folder is displayed only if you select Show Calculations in the settings of the Database Structure pane.
 - Click the calculation.
 - To define the calculation, specify an MDX expression. 
           You can double-click elements to add their unique names to the expression. To create a calculation, double-click the elements and combine them with the standard arithmetical operators. Various functions are available when you click Functions. Pause on the calculation at the point at which to insert a function and then double-click the function.