When creating your second and additional floors, you will want to set the defaults for that floor's structure.
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Rooms, Floors & Foundations
68 - Floor Plan Basics
72 - Additional Floors & Foundation Basics
6122 - Foundation and Bearing Walls
318 - Dropping a Floor and Raising the Ceiling of a Room
5434 - Setting Second Floor Defaults
41 - Custom Flooring
320 - Brick Ledge Foundations
315 - Setting Platform Depths - by Floor or by Area
5202 - Creating Floor Platforms that Hang inside Walls
257 - Extend Siding Over Foundation Slab
54 - Creating a Porch
62 - Creating Custom Room Types
51 - Creating a Walkout Basement
11078 - Basement Design Process
321 - Crawlspace Foundation with Framed Bearing Wall
402 - Stepping a Foundation
314 - Cutting a Hole in a Floor Platform
93 - Creating Basements with Furred Walls
322 - Creating a Split Level Structure
323 - Creating a Split Entry