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If I'm understanding your request correctly, I think you want a single action, set to "repeat every 1 week". Next, use the inspector to restrict the action to M-F.

That should give you the behavior I think you're after. You'll only ever see one overdue copy of the action, and when you check it off, it'll automatically make itself due the following day, skipping Sat and Sun. (iCal's "custom" repeat type uses a similar setup for this type of repeating event, FWIW.)

Hope that helps!