How to make a cross sectional view in Keyshot 3?

Actualy there is no crossection tool in keyshot. You should prepare your model like cross-sectioned in 3d software before exporting it. Some kind of splitting functions should be usefull for that

Here u can find ur questions about keshot
http://grabcad.com/questions/24-_tutorial-keyshot-tips-step-by-step

there is no section view in keyshot u need to make sction in ur modelling software and then import the model into keyshot
there is no alternate way
hope keyshot will have this feature in future