Model Lines to Topography Problem

[Marcel_Rijsmus]

Have a look at this thread

Merging Multiple Curves into one Curve without using Polyline

I’m trying to create a WallByCurveAndHeight however the problem I have with my curves is that they are separated and therefore create not one continuous wall but multiple walls. Is there a way I can merge all these curves into one curve without converting it to a polycurve? The only reason is that the WallByCurveAndHeight node does not read polycurves.   [NeedHelp]