Composites are applicable to Slab and Roofs as well as Walls. You can create your own fills to represent decking, joists, etc. if you'd like (although we just typically use "Empty Fill" and "Wood Studs", respectively, because we don't do material take-offs). Additional graphics (symbol line types, for instance) would still need to be added to the section as they are for walls.
MacBook Pro Apple M2 Max, 96 GB of RAM
AC27 US (5003) on Mac OS Ventura 13.6.2
Started on AC4.0 in 91/92/93; full-time user since AC8.1 in 2004