freight charges

Freight means the charges we pay for truck to deliver the order right?. Is the "F" line type will be only used in Purchase order and not in sales orders? . Kindly explain the freight concept with example

I have exhausted all my ideas. During sales order entry when an order is created a shipment is created and the shipment is rated either using RateWare XL or rates in JDE tables. What triggers this? Related records have PID of N4900090 but from where is N4900090 executed from? I have been...