Using levels from adjacent Feature Surfaces

Hi

I am doing a complex earthworks takeoff for a retained embankment with defined batters, retaining walls, roads and table drains all adjacent each other.

I am able to do this by creating outlines for each surface (as none of them are level, all have cross falls and batters).

Each outline connects to the adjacent one at the same point (chainage cross sections at 50m inervals on a 1.2km length). Therefore where two outlines meet at the same point, I have to enter the elevation at that point twice, once for each outline. I tried the "interpolate" option but it did not work, I think because the outline was not within another outline with elevations.

Is there a way to set the elevations of the new adjacent outline using the elevations of the previous one already entered? i.e. not have to enter the same elevation twice where two outlines share the same point?


Thanks