Create you floors in the normal manner first.
Create a floor in revit.
On the ribbon click level.
When performing the procedures you may notice minor differences in functionality and user interface.
As you place the cursor to create a level if the.
You can use shape editing tools to manipulate the surfaces of your floor elements.
Select one or more levels for which you want to create a plan view.
Architecture tabdatum panel level structure tabdatum panel level place the cursor in the drawing area and click.
The floor boundary must be a closed loop profile.
Once created select the floor element and then use the shape editing tools accordingly.
Select walls in the drawing area to use as floor boundaries.
Add a floor by picking walls to create the boundary.
If it is not active click modify create floor boundary tab draw panel pick walls.
Open the section or elevation view to add levels to.
Please like this video.
Remove all shape edits to your surfaces by means of the reset shape tool.
To sketch the profile of the floor click modify create floor boundary tab draw panel and select a sketching tool.
Click view tab create panel plan views drop down and then click floor plan reflected ceiling plan structural plan in the new plan dialog.