How do I define minimum or maximum rules for a values by criteria rate?

Create a value by criteria definition. Create a rate definition that has a category of Value by Criteria and associate the rate definition to the value by criteria definition.

Create a rate definition that has a category of Derived Rate. Create a rate contributor with a contributor type of Rate Definition, and then select the values by criteria rate definition. You can now define return rate rules for your derived rate, such as a minimum or maximum values. These return rate rules will be applied to the values by criteria rate.