Trim

Menu: Modify>Trim

Default Keyboard Shortcut: MT

With Trim command you can trim objects at a cutting edge defined by other objects.

 
First select the objects that define the cutting edges at which you want to trim an object and then the object.
Objects that can be trimmed include arcs, circles, ellipses, lines, and Polylines

Notice that the trim command does not function if the objects do not intersect.

At the example below  we will trim the two Polylines to the diagonal line.

Before Trim

After Trim