I'm creating a containment dike around and island. I want the berm to tie down to the existing surface, then offset from that tie point 21' to the surface again. I can do an offset from Baseline, or a tie to an elevation in a profile. What I can't do is make the offset 21' from the tie location over an additional 21' to another tie point on a surface.
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I believe that you could do this in two steps. Use LinkWidthAndSlope to move horizontally 21' then add LinkSlopeToSurface with the slope parameter set to "vertical". Turn on the omit link options to hide these two subs. If you want a link between the start and endpoints you could add a marked point at the start and a LinkToMarkedPoint at the end of the vertical link to connect them.
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Try using the LinkOffsetOnSurface subassembly. The offset value is relative to the corridor baseline, not the attachment point. Then, as Steve suggested, set the omit link property to yes if you don't want to see it in the model.
Perhaps I am wrong here. But it appears you need to determine where this first slope hits themud line. Since this varies (I assume) I would run an alignment along this daylight point and go from there with another alignment. I do not know if we have an subassembly that attaches to the daylight point.
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