To create a floor, define its boundaries by picking walls or sketching its profile with drawing tools.
 Build panel
Build panel Floor drop-down
Floor drop-down
 (Floor: Architectural).
 (Floor: Architectural). 
  Where is it?
 Draw panel
Draw panel
 (Pick Walls). Select walls in the drawing area to use as floor boundaries.
 (Pick Walls). Select walls in the drawing area to use as floor boundaries. 
	  Draw panel, and select a sketching tool. See 
		Sketching.
Draw panel, and select a sketching tool. See 
		Sketching. 
	 The floor boundary must be a closed loop (profile). To create an opening in the floor, you can sketch another closed loop where you want the opening to appear.
 (Finish Edit Mode).
 (Finish Edit Mode).