This CAD software tutorial covers how to make face based families, change a family category, and make voids in Revit Architecture. Face based families are pretty handy for a few reasons. a big one though is that they do delete when you erase the host object (this is not the case with wall based and floor based) families. Also face based families are easy to move around, re-host and rotate. See how to create and work with face based families in this Revit Architecture tutorial.