Does the description of advanced support not suffice to distinguish it?
Ask here your questions about advanced usage of Mageia. For example you may post here all your questions about network and automated installs, complex server configurations, kernel tuning, creating your own Mageia mirrors, and all tasks likely to be touchy even for skilled users.
Apart from that, what matters to me is that people will use one of the support subforums for support-type queries, and not "discussion about mageia" or such. Which subforum does not really matter, as long as the OP gets answers to his problem, no?