Kate,
This is a fairly complex situation. Here's where to start:
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Define the types of communications for each BU or Discipline (since this maps to your WS+LP.
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Make these values checkboxes (T/F) or Yes/No/Blank (which I prefer, since a human can read this).
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you'll need separate workflows and pages for EACH WS/LP
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you'll need to setup separate email templates for each WS/LP
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you may be able to get away with using Segmentations and 1 main page, so that you can use the Admin > Email default settings. But i couldn't recommend the details without knowing more about your setup.