The TRIM command allows you to shorten an entity to an intersection or remove a section of an entity between two intersections.
OR
select Trim under the Modify menu,
OR
click on the Trim
button.
Prompt:
Current setting:
Projection=UCS Edge=None
Prompt:
Select cutting edges(s)...
Select objects:
Click on entity or entities that the element should be trimmed back to
or between. See FIGURE below.
Prompt: Select objects:
Prompt repeats to allow you to continue selecting boundary edges. You can trim
more than one element at a time.
Press the Enter key to tell AutoCAD you are through selecting
boundary entities.
Prompt: Select object to trim or [Project/ Edge/ Undo]: Click on the part of the objects you wish to remove.
Prompt: Select object to trim or [Project/ Edge/ Undo]: Either select additional objects that you wish to trim or press Enter to exit the command.
FIGURE ILLUSTRATING TRIM