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Before

After

1. On the [Model] tab, go to
   
   
   
   and click [Subtract (Boolean)].
   
   Alternatively, while the bodies are being selected, right-click the mouse and click [Boolean] - [Subtract].
   
   
   The [Subtract (Boolean)] dialog box will appear.
    

2. Boolean operations include the following:
   Unite: Bodies are united
   Subtract: Tool bodies are subtracted from target bodies
   Intersect: The common portion of bodies is extracted
   
   This session uses Subtract.

2. On the modeling window, select the outer case frame (cylinder) 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. Highlight two outer case frames (boxes) for subtracting bodies and click to select. You need to keep pressing the <Ctrl> key to select more than one bodies.
    

5. Click in the [Subtract (Boolean)] dialog box to exit.
   
   The Subtract (Boolean) dialog box is explained here.
    

• Deselect [Keep Target Bodies] and [Keep Subtracting Bodies].

The outer case frame has been created.