Though tedious you can do this with simple calcs. Using the angle required you can calculate each right traingle per vert and then move them up in the Y axis, I use the "Show CV' table in the attribute editor. I think this is what you mean? Maya. as Laurie has said doesnt have this function. I have tried many ways to get co planar or co linear points to work in Maya and the above method is the only one I have found thus far.

Cheers bullet