Missing Minimum quantity from Item Price

The documentation discusses the Minimum Quantity field on Item Price, which is missing in the application.

The following is an excerpt from the documentation:

2.3 Minimum quantity

This is the minimum quantity of items to be transacted for this price to be applicable and updated in the Item Price list.

Am I missing anything?

Here is the scenario of how I want to define the item price:

If I buy from supplier XYZ and buy 10 or more quantities then the price is $40, if I buy 100 or more then the price is $35 and if I buy 1000 or more then the price is $29.