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Before

After

1. On the [Model] tab, go to
   
   
   
   and click [Subtract (Boolean)] .
    

2. Highlight the bottom case which is the target body and click to select.
   
    

3. In the [Subtract (Boolean)] dialog box, click and activate the list box for [Subtracting Bodies] .

4. Let's select subtracting bodies.
   
   Highlight the top case while pressing the <Ctrl> key and click to select.
    

5. Select [Keep Subtracting Bodies] on the [Subtract (Boolean)] dialog box and click
   
   .
    

Now the unnecessary parts are removed from the bottom case.

* Only the bottom case is shown here.