The reason for doing it this way instead of using sketchup s built in section cut tool is that this way eliminates the empty spaces where a mass has been cut revealing the geometry below.
Floor plan section cut.
Selecting the section cut floor plan generate option from the utilities menu brings up the section floor plan views generate view dialog box.
If part of a floor is cut through the floor should appear to be solid instead of showing any lines from the top of the walls on the floor below.
Plan drawings are in fact a type of section but they cut through the building on a horizontal rather than vertical plane.
The direction of the plane through which the section is cut is often represented on plan drawings and elevations by a line of long and short dashes called a section plane.
The plan is typically cut at a height of about 4 feet but the architect drawing the plan may cut it at a different height.
If you have not setup any views before choosing this option the dialog box will be empty.
It displays a list of section views and floor plan views.
Therefor you see in the cut anything that the plane passes through.