Move Levels & Object List 
 
Move Up One Level 
  
Moves from a lower to a higher level of decomposition. See 2.6 Levels of decomposition for details. 
  
Move Down One Level 
  
Moves from a higher to a lower level of decomposition. See 2.6 Levels of decomposition for more details. 
  
 
Object List 
When the edit option 

 is invoked the following window is popped-up: 
  
  
This activates the three edit options: 
  
"Divide Space" 
"Separate Composite Space" 
"Edit Vertices" 
  
These three edit options are described in more detail in sections 7.23, 7.24 and 7.25. 
 If this window closes whilst you are still in the edit mode you can click on the icon on the generic tool bar and open it again.