We encourage people to book multiple modules of a course, and the amount per module decreases as you book more. Then if you book the entire course, an additional discount is applied.
We also deal with large corporates and offer them a percentage discount off the final amount.
At present applying discounts in our system means the corporate discount is applied to the single module prices, resulting in a larger discount than we plan to give. The ability to select the order would overcome this problem.