To my knowledge, tiered pricing is not currently available for digital products. I hope one day they add that. Our solution to this has been to set the price to the most expensive tier's and then offer discount codes for lower tiers. That way, if a professional purchases it without a code, they pay $1000 but then if a trainee purchases it with a 50% discount code, then they pay $500. This prevents you from needing to duplicate the course.
Bundles are possible! Create the two courses separately and then, on their paywalled pages, add a "Pricing Plan" that includes both courses.