in the grid toolbar to access the Filters window. From the Filters window, click the Change Filter icon 
next to the level name.1. Click the Change Filters icon in the grid toolbar to access the Filters window. From the Filters window, click the Change Filter icon next to the level name.
OR
1. Right-click the level in the grid and select Filter then Edit.
2. The Select Members window for defining the filter will display. Select the members in the Select or Advanced Select Members window, then click OK.
If you need to apply a different type of filter, click the More button and choose Change Filter Type. Then choose the filter method (User List, Named Set, Expression) from the Select Filter Method window. Use the applicable filter window that displays to set up the filter, and then click OK.
User List - select a list from the Select User List Filter window.
Named Set - select a named set from the Select Named Set Filter window.
Expression - adjust the filter expression in the Expression window.
3. If you initiated your filtering from the Filters window, you can apply filters to additional levels by clicking their Change Filter icon. Then see Step 2 above. When you are done in the Filters window, click OK.