Faulting

[JoshM]

I am working through the tutorial data that comes with Rockworks 17 and trying to incorporate 3D faults into my block model. I am able to use the tutorial data fault datasheets to create 3D fault files just fine. However, I want to create a fault that begins well below the surface elevation, so I've changed one of the datasheet file's z value column to a lower elevation, but one still within the project dimensions. The fault file is being created and I can view the 3D ribbon, but whenever I enable the faulted feature in the stratigraphy model, nothing happens. How do I make a fault that starts underneath the ground surface?