When placing a view on a sheet, you can hide parts of the view to focus on one area.
Use one or both of the following techniques:
3D Perspective Views. The Crop View parameter must be selected on a perspective view in order for it to be placed on a sheet. Once placed on a sheet, the Crop View parameter will unable to be changed for the view. Likewise, if you change a parallel 3D view on a sheet to a perspective view, the Crop View parameter is automatically enabled.
In the following floor plan, a non-rectangular crop region hides irrelevant model geometry in the upper-right and upper-left corners of the apartment unit.