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Without seeing what you are really doing it sounds like you may be able to draw another feature line (FL) along the tie in line (or intersection) of the two surfaces. Assign elevations from the EG surface to the new FL and add it to your FG surface.
John Mayo
The model requires an accurately defined daylight to the intersecting surface - there is no fudging. If the accuracy of the model is inconsequential to you - draw the contour you wish add to surface but do no display the surface
Joe Bouza
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