I believe so...When you write a sales order and “Mark for PO”, the PO source field becomes available. The selections are Drop-Ship, Blanket for Drop-Ship, Purchase to Order, and Blanket for Normal. From the Actions button you can create Purchase Orders including of the type Drop-ship or Blanket. Once you do it will be linked to that sales order. When you create the POs that are part of the purchase Order, you will see as the last column a field header in the details that shows the blanket PO linked to that normal PO. If you want the Sales Order to display both the blanket PO and the linked PO, that would be a customization but they are linked and can be traced. Hope this helps.