As we all know, Revit really wants you to be able to properly visualize your building. You may have experimented with Section Boxes in normal 3D views, but you can also use them in Perspective/Camera views.
- Make a new Camera View.
- Go to the View Properties of the Camera View, and select ‘Section Box’
- To modify it, select the Section Box and then switch to a Plan View. The Section Box should still be selected, and you can modify the grips (you can modify these grips in many views).