To Extend Objects in 3D Wireframe Models

1. Click Home tabModify panelExtend . Find
2. At the prompt, enter o (mOde) and at the next prompt, enter s (Standard).

   The Standard mode provides additional options that are useful for trimming and extending in 3D.

3. Select the boundary edge for extending (1).
4. Enter e (Edge) and at the next prompt, enter e (Extend).
5. Enter p (Project).
6. Enter u (UCS).
7. Select the object to extend (2).
   

Note: When you're done trimming and extending in 3D, you might want to change the mode back to Quick.