Hey Felix,
BobCads 4th is indexing and "Wrapping". So it works at the surface level of cylindrical stock.. The geometry used to toolpath with it needs to be as "Unwrapped" which means the surface of the cylinder to be cut is "flat" in the viewport.. (Here's a video that may help to make it clear how it works: http://youtu.be/KCbsi5nmW8Y ) I can help you with how to use it when your ready, in the BobCad forum.. Something new in V24's BobArt is they added a 2 rail sweep. So it can do the scroll/corbel stuff you show there pretty good from 2d geometry.. Again, we can get more detailed later if you want, in the BobCad forum. Your picture is acheivable, but it's a bit complex as "A start". You might want to start with a single scroll. Then it's just a matter of stacking them together to make that picture you show. FYI