We are trying to write a pricing modifier we call ‘Mix and Match’. Here is a business example of wh

We are trying
to write a pricing modifier we call ‘Mix and Match’.  Here is a business example of what we are
trying to do. 

• To receive an additional discount a customer must orders a minimum
  quantity of items (six in the detailed examples below) who are assigned to multiple
  pricing categories.  The discount earned
  will vary based on the pricing category of the item.

Note:  the
order can contain items that are in pricing category codes that do NOT count in
the  qualify for the minimum.   

Our difficulty
in developing a modifier to do ‘Mix and Match’ pricing has been in determining how