Objects creation and modification	Modifying existing objects
Trimming or extending objects
Overview     Operations     Commands

How to extend an object

1. Click on the menu Modify Extend
2. Select the objects that need to act as boundary edges. Press ENTER.
3. Select the objects to be extended. If the SHIFT key is pressed and held, the objects will be trimmed instead of being extended.

 Modify toolbar 

 Command line: EXTEND