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Before

After

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

2. On the modeling window, highlight the central part of the flow path (box) and click to select
    

• To select a particular body out of several overlapping bodies, try the following methods:

1. • Space Key Method
     
     Rest the mouse pointer on the overlapping area, and press the <Space> key.
     Body selection will change. The left-click will fix the selection.
      

   • List Selection Method
     
     Rest the mouse pointer on the overlapping area, and press the <Tab> key.
     The body selection list will appear. Select the body of your interest and left-click to fix the selection.
      

For more details, refer to How to Select Body and Topology where you will find
"Clicking the Mouse" and
"List Selection Method".
 

3. Highlight the inlet (box) while pressing the <Ctrl> key and click to select.
   
    

4. The Unite operation is not affected by the order of body selection.

4. Highlight the outlet (box) while pressing the <Ctrl> key and click to select.
   
    

5. The Unite operation is not affected by the order of body selection.

5. Click in the [Unite (Boolean)] dialog box.
   
    

Three flow paths (boxes) have been created.