You can use the Select Members dialog box to select the special members Prompt, Same As, Current Point of View, and User Point of View.
Prompt acts like a variable that asks the user to select members when a report is run. You determine the dimension and defaults at design time, and the user selects the members when generating the report. Prompt also enables the report writer to filter the dimension members from which the user can select when running the report.
Same As creates a column or row member selection with the same member selection setting as another column or row.
Current Point of View acts as a variable that employs the POV to specify the member of a dimension when the report is run.
User Point of View can be selected as a member on the book POV. The parameters can be modified by the end user.