Hi, just as a side note, in case it helps for something, thought I use the Line consolidation tool to convert polylines to lines, which is the fastest method, but if you copy the polylines to the profile editor, just as if you were going to do a complex profile, they will come as lines too, so you just have to cut/paste them back to your plan.
So again, that is a longer process but just for the knowledge, just in case comes handy in any given situation.