How do I view multiple floors in plan view

[paulcfr]

I'm a newby and sure this question has been asked a million times but search tool does not find answer. I have checked manual, help, online etc...

Can someone let me know how to view multiple floors in plan view. The manual says its possible but doesn't show how. I want to see my basement and first floor superimposed so I can ensure things are lining up between floors. If there is a better way to do this, I'm all ears as well.

Thanks all!!