No, CashFlowTool does not include open purchase orders or sales orders, only actual invoices (AR) and bills (AP). The information in CashFlowTool is generated from your general ledger in QuickBooks (i.e., the transactions posted to accounts). Since purchase orders and sales orders are not posted to the accounts, they are not included.
You can add purchase orders and sales orders into the cash flow forecast by creating a customer or vendor in CashFlowTool (i.e., called "Open POs") and add the individual items that are outstanding. This will make it easier to track them and you can also remove the item from the forecast when the bill or invoice is actually recorded in QuickBooks.