AFAIK the AppBuilder has not been changed much from Progress V9 to OE11. It is pretty much the same as Progress focuses on the Eclipse based development environment that is now called Progress Developer Studio ( was OpenEdge Architect ). The special comments the AppBuilder inserts into the code on which the section editing function works is the same. From that point of view there is no need to convert the source code - just open it in the AppBuilder.
Heavy Regards, RealHeavyDude.