To create a floor, define its boundaries by picking walls or sketching its profile with drawing tools. 
-  Click Architecture tab
Build panel
Floor drop-down
 (Floor: Architectural). 
 
-  Draw the floor boundaries, using one of the following methods: 
  
- Pick walls: By default, Pick Walls is active. If it is not active, click Modify | Create Floor Boundary tab
Draw panel
 (Pick Walls). Select walls in the drawing area to use as floor boundaries. 
	  
- Sketch boundaries: To sketch the profile of the floor, click Modify | Create Floor Boundary tab
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. 
  
 
 
- On the Options Bar, for Offset, specify an offset for the floor edges. 
  
Note: When you are using Pick Walls, select Extend into wall (to core) to measure the offset from the wall's core. 
  
 
 
- Click 
  
 (Finish Edit Mode).