You can use shape editing tools to manipulate the surfaces of your floor elements.
Create a floor in revit.
The floor boundary must be a closed loop profile.
As you place the cursor to create a level if the.
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.
Architecture tabdatum panel level structure tabdatum panel level place the cursor in the drawing area and click.
On the ribbon click level.
Select walls in the drawing area to use as floor boundaries.
Select one or more levels for which you want to create a plan view.
Please like this video.
If it is not active click modify create floor boundary tab draw panel pick walls.
When performing the procedures you may notice minor differences in functionality and user interface.
Edit the floor boundary and use the align and trim tools to create a closed loop sketch.
Open the section or elevation view to add levels to.
Create you floors in the normal manner first.
For type select a view type from the list or click edit type to modify an existing view type or create a new view type.
Once created select the floor element and then use the shape editing tools accordingly.