You can use the Union command to unite two or more 3D Solids into one 3D Solid. 

The command can also be used with regions.


This is how you unite multiple 3D Solids into one 3D Solid:

  1. Click on 3D Solid > Union on the Ribbon.

or

  1. Enter UNION in the command window.
  2. Select the solids to be fused in the graphics area.
  3. Press Enter to complete the selection and exit the command.