How to use more than one Section Plane simultaneously

The *Section Plane *is a powerful SketchUp feature. You can cut your model anywhere in realtime. You can create as many section planes as you like, but SketchUp will only allow one single active section plane at a time (in the same context, as we will see). To use simultaneously active planes, the trick is to group your model with a section plane and create another one outside the group.
A model without Section Planes.

A model using two section planes simultaneously.
Create the first section plane, and place it at the desired position

 

Read full tutorial