Revit :: Interior Recess Lower Slabs Cannot Be Seen

I have an  interior amphiteather with stepped concrete steps and a bottom lower slab, which are recessed and below the ground floor level of 0'-0".

Before adding the topography to the job, the steps layout and the lower salb showed on plan, but since adding the topography, the lower steps and the lower slab do not show.  Cutting a section thru the amphiteather, the earth is seem to be above the lower steps and the lower slab. 

How can I modify the earth in this interior area of thh building so the earth (and topography) is below the concrete steps and the lower slab?  (so these recessed concrete floor elements could be seen in the plan of the building)