AutoCAD 2008 User's Guide > Work with 3D Models > Create 3D Models > Create 3D Solids and Surfaces > Create Composite Solids > 
Create Composite Solids
Concept Procedure Quick Reference
 
 
 

To combine solids

  1. Click Modify menu Solid Editing Union.At the Command prompt, enter union.
  2. Select the objects to combine.
  3. Press ENTER.
 Toolbar: Solid Editing 
 Command entry: UNION
 Dashboard: 3D Make panel, Union