It's quite common for Mavens to create products that're related to another product, such as a Beginner, Intermediate, and Advanced set of courses. Each of these course products may be offered individually through Single Purchases but you may also combine them into a grouped product through the use of Bundles.
Bundles are any combination of Courses, Downloads, and Live Streams.
To create a Bundle....
Then under the Sell tab set the Product Type to Bundle. You may then choose which of your other products you wish to include in the bundle.
Any customer that purchases the bundle will immediately have access to all products included.