I am new to the Home designer world.  I purchased Home Designer Architectural 2015 last month.  I recently upgraded to the Professional version because I needed the extra  features.   
I am trying to design a home that is tucked into hill.  The lot I have is pretty steep.  I have designed the structure just fine, but building the terrain around it is difficult.  Basically I have a two story structure, but each level has a foundation.  It looks like an upside down L.  
My question is should I build the structure then the terrain, or the terrain then the structure?  I appreciate any advise.