System and method for customized built-to-order assembly

A method and system for configuring a product assembled from a plurality of components, where each component may be available in several variants; the method comprises the steps of presenting to a user, via a user interface, a first plurality of available variants of a first one of said plurality of components; receiving from a user an indication of a first variant selected from the first plurality of variants; receiving inventory data from an inventory management system, the inventory data indicating an available subset of the first plurality of available variants as being in stock; indicating to the user, via the user interface, the first subset of the first plurality of available variants as being selectable.