The settings page of the Free shipping and Shipping freights add-on enables a store admin to specify how to calculate the shipping cost for products with the assigned shipping freight. It can be either the product's shipping freight only or a sum of the product's shipping freight and the regular shipping rate set for the customer's location.
Suppose the setting has the value of "shipping freight + regular fee." In that case, shipping costs are calculated as a sum of a regular shipping fee plus all additional freight values of the products with the constant shipping freights from this order. Even if the order includes only products with the defined shipping freight property, this rule applies.
If the setting has the value of "shipping freight only," shipping costs are calculated as a sum of all freight values of the products with the constant shipping freights from this order.
To understand the rules better, let us consider the following example.
We have:
Product_A with a defined shipping freight of $10;
Product_B with a defined shipping freight of $20;
Product_C without a defined shipping freight value;
A regular delivery option at $12 per order.
If you set the the "Shipping cost for products with a defined shipping freight value should be calculated" setting to "shipping freight + regular fee":
The total shipping cost for an order containing Product_A + Product_B + Product_C will be $42 ($10 freight + $20 freight + $12 regular delivery fee);
The total shipping cost for an order containing Product_A + Product_B will be also $42 ($10 freight + $20 freight + $12 regular delivery fee);
The total shipping cost for an order containing only the Product_C will be $12 (the regular delivery fee).
If you set the "Shipping cost for products with a defined shipping freight value should be calculated as" setting to "shipping freight only":
The total shipping cost for an order containing Product_A + Product_B + Product_C will be $42 ($10 freight + $20 freight + $12 regular delivery fee);
The total shipping cost for an order containing Product_A + Product_B will be $30 ($10 freight + $20 freight);
The total shipping cost for an order containing only the Product_C will be $12 (the regular delivery fee).
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