Trim Tool
The Trim tool trims a portion of the selected object. Objects that can be edited in this manner include lines, arcs, rectangles, circles, ovals, polylines, and polygons.
 
1.
2.
Click the Trim tool from the Basic palette.
The standard arrow cursor changes into a hand.
3.
That portion of the object is trimmed back to the closest intersection with another object.
To trim another portion of the same object, move the hand to that section and click.

Editing 2D Objects : Trimming and Clipping Objects : Trim Tool

Nemetschek NA
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Fax: 410.290.8050