Openroads Template- Building Foundation Linear Template

Looking for some Openroads Template help, I would like to use a Linear Template to help model an excavation for a bunch of building foundations in which I have laid out horizontal and vertical geometry. Unfortunately, my experience with creating templates is limited and the more tutorials I watch, the more I get confused. 

I would like to create a template that follows my Geometry and targets my active terrain to help me create a new terrain for over-excavation of a building foundation, while also quantifying the AB backfill. Any help would be very much appreciated.