I can't remember if 11 had Profile Manager.
I only have back to version 12 on my laptop.
If so that will work if you create a custom profile wall (or beam).
Otherwise you are stuck with lots of single plane roofs.
The only other things I can think of is a maybe trying to put together some primitive shape objects from the library and using Solid Element Operations (if that exists in 11?) or scripting it with GDL if you are able to do that.
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I looked at this in ArchiCAD 10, and the Profile Manager is there, but Complex Walls (or Beams) do not have the Circular Geometry Method (maybe this was added in AC11).
You could use the Profiler Add-On, which takes a drawn profile and converts it to an Object which can follow a curved path, see the description: About the "Profiler" Add-On
I thought this was a Goodie that would be downloaded from Graphisoft, but could not find it there, you should check to see if it is already installed on your computer (you can use the Add-On Manager to check for it).
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.
Thank you for your input. I did find the Profiler tool in 11 and am now playing with that. It does indeed allow me to create the 'smooth curve' over this roof portion. Now I'll just have to play with it more to get it to look just right.