charges are applied through one of the three methods:
Standard shipping relies upon the shipping charges specified
for individual SKUs. With this option, shipping charges are applied based
on the quantity of SKU ordered multiplied by the shipping price represented
in the “Shipping Charge (A)” field for the particular SKU.
Shipping by Order Sub-Total
Selecting this option allows you charge different shipping rates based
on the overall order Sub-Total only. When utilizing this method, shipping
charges associated with individual Skus through the “Shipping Charge
(A)” field will be excluded from the checkout process.
Charges Using Custom PHP include
In keeping with the Pro Edition’s dedication to flexibility, custom-developed
PHP includes can be uploaded and integrated with the Shopping Cart module.
Once uploaded, these includes are selected through the Custom Shipping
option. (See Custom PHP Includes for more information).