the hotspots contain info about the imported points 3D coordinates and the lines are the constraints between hotspots.
Now you have to define the terrain outline, using the ArchiTerra Outline tool and then you can buil the Terrain using the Terrain tool.
... but did you get the user manual too from your reseller?
Fabrizio Diodati
Graphisoft Italy Srl | Via Rossignago 2/A Spinea Venezia 30038 Italy