Re: Importing terrain files?
You can use a rectangle/plane with the Object->Boolean->knife functions. That may be a way to create a vertex in the right location.
To make a line from two vertices, select both, Vertex->Create-ordered-surface (that will make a two vertex polygon, an invalid polygon shown in blue) then press Set-surface-type->Line (in the bottom left of the control panel). That will turn it into a valid line.
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