Columns, Stairs and Slabs
Columns have a top bound and a bottom bound – these control the overall top and bottom of the column. There are several choices…
As with the walls and columns, you can use the story settings to control the start and stop of your stairs. But you can only control the top bound and the bottom bound of the stair, you cannot control other parts of the stair like the handrails.
Slabs have Z Ref Level – this is the level that controls the slab datum (usually the top of a slab component).