In our area of expansive soil it is ommon to create a slab with thick deep perimeter footing as well as what they call "grade beams" (thick concrete ribs entrenched beneath the slab), as well as 12" concrete piers drilled to 15 feet.
I'm confused whether Home Designer can be configured to create those grade beams and piers uniformly beneath a slab. Ai seems to think that the "grade beam on piers" setting is just to create a crawl space with a wood framed floor.