Abstract: Identifying parts for an assortment. Receiving data characterizing: storage capacity by part category, parts in the category, rules applicable to the category. Assembling rule sets requiring compliance with each rule for a part to be a rule set group member. Receiving data prioritizing rule sets. Beginning with highest priority rule set, proceeding by order of rule set priority, determining if each part is rule set group member. For parts not a member of the rule set group, determining if each of those parts is a member of the next highest priority rule set group. Receiving data for prioritizing parts in a rule set group. Allocating parts to the assortment beginning with the highest prioritized part in the highest prioritized rule set group, and continuing in order of part priority within a rule set group, then continuing through subsequently prioritized rule set groups until inventory storage capacity is reached.