Click Viewpoint tab > Sectioning panel > Enable Sectioning .
Navisworks opens the Sectioning Tools tab on the ribbon, and draws a section plane through the model in the Scene View.
Click Sectioning Tools tab > Mode panel > Box .
The box is now visually present on the screen, with the move gizmo enabled by default.
Drag the gizmo to box-section your model along the axes.
To save the current sectioned viewpoint, click Sectioning Tools tab > Save panel > Save Viewpoint .