Use this procedure to remove one or more property sets from an object. If an object is included in a schedule table, any data in the table obtained from the removed property set displays question marks in the table. 
- Double-click the objects from which to remove property set data. 
 
- On the Properties Palette, click the Extended Data tab. 
 
- Click 
.  
- Select property sets to remove, and clear any property sets to remain attached to the object. 
 
- Click OK.