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

How to trim an object

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

 Modify toolbar 

 Command line: TRIM