You create floors by defining their boundaries, either by picking walls or using drawing tools.
Typically, you sketch a floor in a plan view, although you can use a 3D view if the work plane of the 3D view is set to the work plane of a plan view.
Floors are offset downward from the level on which they are sketched.
You can create a sloped floor, add slab edges to a floor, or create multi-layer floors.
In a conceptual design, you can use floor area faces to analyze masses, and create floors from a mass.