discounted course bundles and paid course extension

Is there any way (or add-on) to bundle multiple courses together into one package, that you can sell at a discounted price?
For example I need the ability to sell a beginner, intermediate and advanced course all at once, but I want to make it cheaper if you buy them bundled, instead of individually.

Also I know there is a way to set a time limit for how long a user can enroll to a course. But is there a way to sell time extensions?

Thank you very much!!