Revit Tutorial – How to show load-bearing shade hatch under for structural drafting of concrete slabs

What structurally supports a slab under is more important than what is over for structural drafting. For example; How can I tell from a plan view how far this slab is spanning? Are any columns or walls transferring load through slabs to the supports under? In this Revit how to video, I demonstrate two hacks for showing the load-bearing shade under for structural drawings.