You can create new DAX calculations for your report without updating the cube.
These calculations are stored in the workbook and are available from any grid, table, or formula.
Access the wizard through the Custom Calculations ribbon item. Select the DAX button (highlighted) to create a new calculation, and then use the controls on the right to select
- Table the measure will appear in
- Name for the measure
- Formula to define the measure
You can drag tables, columns, and measures from the tree on the left into the formula area to insert their names.
Formula
Please see the Tabular section of the formula reference.