text: 4.5 Create a PizzaTopping Hierarchy 
  We will use Tools>Create class hierarchy again but this time to create a more interesting hierarchy with 
  additional subclasses to model the subclasses of PizzaTopping. 
  
  **Exercise 8: Create subclasses of PizzaTopping**
  
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  1. Select the class PizzaTopping in the class hierarchy. 
  
  2. With PizzaTopping selected use the Tools>Create class hierarchy menu option. 
  
  3. This will once again bring up the wizard. We want all our toppings to end in Topping so enter Topping 
  in the Suffix field. Then create the nested structure as shown in figure 4.9. Use the Tab key to indent 
  classes where needed. 
  
  4. Select Continue. This will take you to the window that asks if you want to make sibling classes 
  disjoint. We do want this so leave the box checked and click Finish. Synchronize the reasoner. Your class 
  hierarchy should now look like figure 4.10. 
  
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