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Do you *really* need a parameter? You can set a filter on the EmpID dimension field - set it to be a single value dropdown and to display the 'All' value.
If you truly do need to have a parameter, you can create a calculated field and add this field to your Filters pane, filtering on value=TRUE:
[Parameter All or Single]=='All'
OR ([Parameter All or Single]=='Single' AND [EmpID]==[EmployeeID Parameter])
Thanks a lot Brent !! It works !!