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Before

After

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

2. Highlight the vertically oriented pipe (cylinder) on the modeling window 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.
     The 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. Also highlight the horizontal pipe (cylinder) while pressing the <Ctrl> key and click to select.
   
    

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

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

Two pipes (cylinder) have been united.