What is the difference between Managed C project with QNX toolchain and QNX Project?
Managed C project (MBS) with QNX toolchain can be used in similar way as QNX Project. They are both managed projects. QNX Project is based on qnx recursive makefiles, when you change setting of QNX Project you modifying a makefile for this project. If you change makefile manually – QNX Project would read and recognize this change (it may be limited to known build macros). Managed project stores all setting in XML and they cannot be changed outside of IDE. You can pick builder for Managed project – internal builder, or external make builder. In the second case, makefiles would be generated that represent build process for this project, but you cannot change those makefiles. Besides that, MBS has a bit more modern UI and more flexibility for project structure (you can exclude some files to be compiled for example). On the other hand QNX Project has very good build variants structure which is nice when you are building for 5 platforms at the same time.
