Calculating Freight Before Delivery.

SOLVED

Hi

I want to be able to calculate the freight on the Sales Order before the shipment is created, for the purpose of putting this on the Sales Order Acknowledgement we email, once the order is taken.  The Freight is calculated against Thresholds we have set up in the Carriers option. (GESBPT) and also the simulation in there calculates it correctly.

I've looked at other suggestions on here, however I cannot seem to get it working.  Any help would be appreciated