Data Security in Dashboards

Hi,

We are creating a Dashboard in Dashboard Design Tool with SAP BW as data source.

We need to know how to apply data security for different users accessing the dashboard.

For eg, complete data is for North,South,East,West.

And User A can view only North data, User B can view only East data and so on.

Is it possible to have this kind of data level security in one dashboard for different users.

Please suggest.

Thanks

Vaishali