Tiered Class Pricing
The tiered pricing is enabled in the Course Type edit screens. To turn on tiered pricing for a given course, check the "multiple pricing levels" checkbox (1). Once enabled, you'll want to fill in the Price Level Prompt (2), which is a bit of text that is displayed to your registrants explaining how the selection should be made. Below that are the actual pricing levels (3). Each level contains a price, price code, and description. The price and description are displayed to the registrant. The price code is an internal code used to let you know how their price was derived.
You can now Sort the levels by selecting the arrows on the right side.
Below is a screenshot from the first page of the registration process. It shows the prompt and the price levels listed in a dropdown (called "registration type" here). The registrant must select one of the registration types before proceeding. Be sure to name every price level different, the system will not pick up the correct price if the code for the price level is named the same.