- 
				From the Interactions section of the action bar, click the Model Change Manager
					 . .
					The Model Change Manager appears and displays all
						current steps in the simulation.  
 
-  
		  To activate the model change feature, click "+" in the 
			 Model Change Manager. 
		   
		   
			 -  
				Add a descriptive name and select the region (support) for
				  which you want to activate model change. 
				 
			 
-  
				Click 
				  OK. 
				 
			 
-  
				Repeat for each region of the model for which you want to
				  activate model change. 
				 
			 
  The 
			 Model Change Manager will indicate by checked
			 boxes that model change is activated for all regions you chose and that no
			 regions have yet been removed. 
		   
-  
		  To remove a region, go to the 
			 Model Change Manager. 
		   
		   
			 -  
				For each activated region, choose the general analysis step in
				  which you want to remove the region by clearing the box associated with that
				  step. 
				 
				All subsequent steps are automatically cleared, indicating
				  that the region is removed for these steps. 
				 
-  
				To add a removed region back into a subsequent step, check the
				  box associated with that step. 
				 
				Similar to clearing the check box, all downstream steps are
				  automatically added indicating that the region is added back in for these
				  steps. 
				 
-  
				Repeat the above actions for each region that you want to
				  remove and for which model change has been activated. 
				 
			 
  
			  The 
				Model Change Manager will indicate by
				checked and cleared boxes the current status of each region as being either
				removed or not removed. 
			  
 
 The process described above allows you to easily remove or add
		regions of your model.