I am very new to Retail Management, and am trying to enter inventory, and create a purchase order. I can't figure out how to enter various costs for the same item from the same supplier. For example, when we purchase in lots of 50 pcs., the item cost is .50 per item (total cost of 25.00). However, if we purchase in lots of 100 pcs, the item cost is .47 per item (total cost of
47.00). We can also purchase the item in boxes of 10 (5.50 per box for a cost of .55 per item). How can I enter these costs so when I place a purchase order, the cost will be correct according to the quantity ordered?