Fransole
This probably won't help with your current project however attached is
a unified slab, a footing and a turn down. The turn down is a profile
placed with the beam tool and the floor slab and footing are placed
with the slab tool...............all unify in a section cut.
AC 19-26 Windows 10 64 bit, Dell Prercision 7820, Xeon Silver 2414R ( 12 Cores), 64 GB Ram, Quadro RTX 4000 8GB