Warehouse optimization is a process that aims at improving the management of time, space, and resources inside a warehouse, minimizing the overall costs yet ensuring a satisfactory quality of service for the customers. When running an efficient warehouse most effort is on the inventory management, which is a well-known challenge for businesses: on the one hand they have to avoid late product supply, which would result in lost profits, while on the other hand they need to focus on a careful inventory control to mitigate the rise of costs, caused by an excessive accumulation of products. The purpose of this thesis is that of supporting industrial fleet managers when vehicles undergo maintenance, providing a way to cope with the need of spare parts under realistic situations, represented by the uncertain nature of components demand.