Geopak SS2, or SS3 or SS4?
If you're using Geopak with OpenRoads, you may be able to simply take your 3d contour map and merge your survey terrain onto it. Make a complex terrain model, first add your terrain from contours as your primary terrain model, then merge--not add--your survey terrain on top of it.
If you're using Geopak without OpenRoads, you should be able to do the same. Just the tools you'd use are different.
If you're using Geopak with OpenRoads, you may be able to simply take your 3d contour map and merge your survey terrain onto it. Make a complex terrain model, first add your terrain from contours as your primary terrain model, then merge--not add--your survey terrain on top of it.
If you're using Geopak without OpenRoads, you should be able to do the same. Just the tools you'd use are different.