One of the "Moodle" things that is getting lots of kudos here is categorisation and using this for create a structure along the lines you describe that is dynamic (expand/collapse).
In theory I do not see why this could not be done in Blackboard. It would then provide a use for the course catalogue which is for us a pointless tab as the categorisation is not set as it is never used for anything useful .... a self fulfilling cycle!
Peter
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