This fun video tutorial below shows you how you can design the slabs of a 4 storey parking garage or 'parkade' in a matter of minutes.

http://www.youtube.com/watch?v=0mHjQE4vYEk

The single, segmented slabs are sloped and climb 10 feet per rotation.

We start by creating a slingle flat slab.
Then we use the 'Shape Editing' tools to add new points.
Then we alter the new elevation points to form the 10 foot overall rise / rotation.
Then we add in a few more (low points) for floor drains on the flat landings.
Lastly we use REVIT's 'Copy' and 'Paste Align' tools to repeat the floor up to Level 4.
Add your walls, stairs, elevator, landscaping and 'Bob your's uncle'.