So this is probably pretty simple for someone with the right skills.
We need a simple course structure created in moodle so that we can have say 25 individual modules available for individual purchase. But then also offer some of those modules as part of different courses that can also be purchased- eg. a Diploma, a Certificate, an Advanced Diploma etc. all would have different combinations of above individual modules.
The user would be automatically enrolled in the necessary modules according to that 'package'.
That's pretty much it.
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Experienced Moodle developer, you'll find my name on the attendee list for the 2011 MoodleMoot UK. Looking forward to hearing from you! More details in the private message.