Hmm, it would appear it's not a goodie, but comes pre-installed.
It hides under Design > Design Extras > Profiler.
It's basically a slightly less advanced way of making the morph extrusion, but it turns it into objects.
You draw a fill in floor plan and a path with polyline and use magic wand to follow the path.
It has been a while (before they made complex profile beams, pretty much) since I used it, so my memory is not perfect.
Personally I prefer the beams, using a 0 thickness SEO roof to create angles/mitred joints as needed.
It's a bit fiddly, though. I generally fake things with a few single plane roofs in the early stages of design.
You can make some nice stuff with it though, below is an old project from I believe ArchiCAD 15 (so no morphs). It is 100% complex profiles, with a few of them saved to object to be able to rotate them.
Erwin Edel, Project Lead, Leloup Architecten
www.leloup.nlArchiCAD 9-26NED FULL
Windows 10 Pro
Adobe Design Premium CS5