You can make filters global to one particular datasource only.But if you create parameters that will be global to all the datasources and you can use parameters in calculated fields.
So if we have some 50 values in one filter then how to create calculated field for that ?
That depends on the scenario.
Assume you have a scenario like below.
you want to filter the data in the dashboard across multiple datasources using a particular column.
1.create a parameter where you enter all the field values in the filter
2.create a calculated field where you can check parameter value=actual column value.keep that calculated filed as a filter and keep only true value.
Note: Parameters will not get updated automatically.
thanks philip will try this