Arena Simulation -Inventory sharing system subjected to time constraints

Graduate simulation project asap The inventory system will have 3 retailers where each has inventory on hand Second each retailer receives inventory through normal replenishment from the central warehouse. Central warehouse has supplier which supplies warehouse, which has infinite supply. When one of retailers has no stock on hand it places and order to warehouse, but in case when waiting for normal replenishment is too long, because of high downtime cost, thus request emergency supply from the OTHER retailer, to satisfy the demand as quickly as possible. This is a basically my model, simple and no animation included, just entity movement. y.