I'm currently using Revit 2018 in the engineering environment. To maintain our company drawing standards which were produced way back with Autocad and in keeping with engineering norms we find showing the substructure below a slab/floor is impossible to hatch, since Revit hatches are produced at an active cut line level only which generally is above slab/floor. This applies to all brick or concrete walls, RC or steel columns....etc. If there was way (a simple way) to assign a hatch pattern to supporting elements below floors this would be a great advantage and enjoying the benefits of Revit a whole lot more. One could then vastly distinguish the difference between our drawings and that of the architect's who generally more interested in what happens above a floor.