Hi David,
I have Home Designer Pro 2019 20.2.3.3OSX. I just want to draw a flat roof terrace with a 1.2m wall around the perimeter to act as a balustrade. The flat roof will be waterproofed, a layer of geo fabric placed and have drainage cell sheets laid before soil and turf. The slab doesn't need to be visibly tilted. I can specify the fall ratio to the drainage points around the edges in seperate CAD details.