Projecting two vertical profiles onto a line

Question

Hello, 
 I'm trying to do something that should be relatively simple, but there doesn't seem to be a tool or workflow to get it done in Microstation. 
 Specifically, I want to project two vertical profiles onto a particular element such that it's vertical profile is controlled by changes in either of the first two. 
 In the picture below, I have the basic layout for a median island. The two crossing lines in the center represent the median's centerline (vertical) and cross slope (horizontal). In some cases, the median cross slope may break at the middle and slope in opposite directions. 
 What I need to do is to project the cross-slope line profile and the centerline profile onto the remaining geometry. Either project the combination of the profiles onto the end arcs or the connecting tangent lines - it shouldn't matter. 
 The only way I can get this done otherwise is to use two cross slope lines (each one connecting the ends of the arcs) and eliminate the middle cross slope line.

Derek Schmidt · Accepted Answer

Ok, so what you want is to project the cross-slope profile (the horizontal line in your image) in a way that the semicircles will pick up the elevation. 
 Here's a workflow suggestion: 
 
 Since you already have one cross-slope line with profile, do a single offset copy to the north and south so that the entire island is between these lines. 
 Project the cross-slope profile to each of the new offset copies. 
 Make a construction-level terrain model of just the two offset copies. 
 Profile the semicircles from this terrain model. 
 
 For the record, the reason you can't do it the way you expect to work is that the project profile tool projects from the source element to the target element where the source element has an address from the target element. (I do have some vague memory that there is some profile projection tool that allows you to project perpendicularly from the source, which would work perfectly for your expected workflow which is far simpler than creating a terrain model.)

Derek Schmidt · Answer

Actually I should mention a caveat for the solution above. If you make only two offset copies and use only those two copies in the terrain, that suggests that you're working with a plane. If your profile is in a curve, this wouldn't be a very good solution. 
 
It might be better to start with a line that represents each typical lane line complete with elevation, and then project from each of those lane lines to the centerline of the median. Then take your terrain model from that.