Filtering the user selection

Hi Frns,

I have a report with dimensions and 500 measures...

D1      D2      D3      M1      M2      M3      M4...

A     B          C          20       10     30          40..

If end user selects M2 AND M4...

D1     D2          D3               M2          M4

A         B          C                  10          40

Depending on the user selection (Measure value). If he don't select any column it should not be there in report.

Thanks

Riaz