How to modify an invoice with "Local Pickup" to include a postage cost and recalculate the invoice "Total Due".

[jocksquin]

I have listed 3 items as Local Pickup as postage varied considerably depending on buyer location. These 3 items sold and I now have the delivery addresses and I want to add the postage costs to each invoice and reflect the postage cost in the "Total Due" amount.

The invoice process allows me to add another delivery method and the cost BUT,will not allow me to recalculate the total before issuing the invoice.

How do I overcome this

Rgds

Ron(jocksquin)