Use this procedure to purge unused display sets from a drawing. 
You cannot purge a display set assigned to a display configuration, or predefined display sets such as Standard, Model, or Plan. 
Tip: To find out if a display set is assigned to any display configurations, select Configurations in the left pane. The right pane lists each display configuration and the display sets it uses. 
-  Click 

. 
  
- Click Sets, and click Purge 
. All display sets that you can purge are selected in the Purge Display Sets dialog box. 
  
- Clear any display sets that you do not want to purge, and click OK twice.