The Graham Corporation is a parts store that operates 100 retail shops throughout the Midwest. The company maintains a centralized purchasing and warehousing facility. All purchases of parts are placed through the corporate purchasing department to take advantage of quantity discounts offered by the supplier. The parts are received at the central warehouse where current inventory records are maintained, including designated reorder points, optimum order quantities, and balance on hand information for each part carried. The retail shops will submit a Parts Requisition Form to the central warehouse to fill orders from inventory and have them shipped to the stores. Three copies of this form are prepared. The original is filed by date and the other two are sent to the warehouse. When the quantity on hand falls below the designated reorder point, the inventory control department prepares a purchase requisition form. Two copies are prepared. The original is sent to purchasing and the copy is filed numerically. Based on the purchase requisition, the purchasing department prepares a purchase order (five copies). Copy 1 is sent to the vendor, 2 to accounts payable, 3 to inventory control, 4 to the warehouse, and 5 filed by date. When the parts are received, the warehouse will prepare a receiving report (four copies). Copy 1 is sent to accounts payable, 2 to the purchasing department, 3 to inventory control, and 4 is filed with the purchase order. Lastly, when the invoice is received from the vendor, there are two copies. The original is sent to the accounts payable where it is compared with the receiving report and the purchase order. A check is prepared and sent back to the vendor with the duplicate copy of the invoice.

I have to create a flow chart for the follwoing senerio and don't know where to start.