To Delete a measure
Display the measures in the middle pane, select the measure to delete, right-click and select Delete.
OLAP Cube Calculations
Calculations provide the ability to define the derivation of a value at query time within a cube. The calculation is most typically a numeric derivation based on measures, but can be defined against any dimension. The calculation is defined in MDX (Multi-Dimensional eXpressions). The definition of a Calculation is shown by right clicking a Calculation and choosing Properties. The following Cube Calculated Member Definition dialog is shown: