AutoCad :: Aligning Parabolic Curve Tangent To Two Points

I have come up with a parabolic curve from a 'Sag Chart' program for calculating wire sag between Utility Poles. I now need to place this curve into my Profile that has the poles laid out in it. I need to make the curve Tangent at each attachment point between two poles. The best I can do as of now is eyeball it in there which will get me the sag distance pretty closly but as any Autocad user knows if it isnt exactly aligned it will drive you nuts. I made a rough sketch of what im trying to do.