An apparatus for processing a composite trading order comprises an interface operable to display a composite value representing a weighted quantity of a plurality of trading products. The apparatus further comprises a processor operable to receive at least one input representing a composite trading order, wherein the at least one input comprises a quantity that is equal to at least a portion of the weighted quantity. The at least one input is usable to generate one or more constituent trading orders that, when filled, combine to satisfy the composite trading order.