You can use 
  Revit LT to open a 
  Revit project that contains masses. 
To see masses in a view
- Click View tab
Graphics panel
 (Visibility/Graphics). 
 
- On the Model Categories tab, for Filter list, select 
  Display categories from Revit and Revit LT. 
 
- In the Visibility column, select the check box for 
  Mass. 
 
In 
  Revit LT, you can do the following: 
-  Add instances of a mass family that is loaded into the 
  Revit project. 
 
- Move masses and modify their shapes using shape handles. 
 
-  Use the Family Editor to modify the mass family. 
 
However, you cannot do the following: 
- Edit masses using the Edit tools. 
 
- Create building elements (walls, floors, roofs, curtain walls) from mass faces. 
 
- Create mass families.