Trimming Elements to Intersection Point(s)

You can trim an element by simply removing the part extending beyond its intersection point with another element, or even cut out a part of the element between two intersection points. Trimmable elements are: Walls, Beams, Lines, Circles, Arcs, Polyline and Splines.
To trim an element take the following steps:
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Choose the Edit > Reshape > Trim command, or press the Ctrl (Windows) or Cmd (Mac) key.
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The Scissors cursor appears. Move it to a trimmable element and click the segment you want to trim.
Note: In the 3D window, you can also click on a Wall or Beam surface for trimming.
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The clicked part of the element between the two nearest intersection points will be deleted.
For example, here we will trim part of the beam - the part that falls between the first two walls on the left.
Trim Elements to Roof or Shell
Cropping with a Remote Roof