-  
  From the 
	 Operations section of the 
	 action bar,
	 click 
	 Edit Planes 
	 
 . 
   
  The 
	  reference plane system
	 appears in the edition mode. 
	    
    
 -  Click any one of the value editor boxes.
 - Enter the required offset value and click anywhere in the 3D area.
The offset between all the reference planes is modified.   - 
        To modify the offset for particular planes, 
          select the required reference planes in the 3D area.
        
      
 - 
        
          In the context toolbar, 
         click Edit Offset 
  .
          
        
        
      A box appears displaying the offset value between the selected reference planes.   - 
        Type the required offset value in the box.
          
        
        
        
      
 - 
        
          
        Click anywhere in the work area.
        
        
          
        The offset value for the selected planes is modified.   
        
    
      
     
   
  
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