Create a loft by using the Open Below room type and then use stairs to create access.
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Walls, Rooms, Floors, and Foundations
2224 - Exterior Walls
2311 - Constructing Different Wall Types
2319 - Railings: Using Multiple Profiles & Materials for Railing Components
2505 - Drawing Walls at Any Angle
2229 - Rooms and Interior Walls
2232 - Creating Multiple Level Floor Plans
2233 - Reference Display
2299 - Creating a Loft
2287 - Moldings
2234 - Foundations and Basements
2235 - Walkout Basements
2236 - Daylight Basements
2314 - Foundation Cutouts for Garage Doors