Since item in an independent demand invetory system "stand alone" the appropriate reorder point for each item must be calculated using order-point formulae
Order-point formulae are used to determine how much of a given item needs to be ordered where there is independent demand. In these formulae, a reorder point (ROP) is set for each item. The ROP is the lowest amount of an item you will have on hand and on order before you reorder.