Section Box for Navisworks allows you to dynamically move each of the six sectioning planes (Top, Bottom, Front, Back, Left and Right), giving you and immediate visual of your sectioning. The large sliders rapidly move the sectioning planes to quickly find the desired location, while the smaller spinners give you a more precise movement allowing you to refine the location. You can also select a point in your model to locate any of the six planes. Sectioning can also be done by Level or by Grid Lines.
Note: This app uses a custom installer (and not the standard App Store installer).