1. In the administration panel, go to Administration > Shipping & Taxes > Shipping methods.
  2. Create a new shipping method or choose the existing one.
  3. Click on the name of this shipping method. The Editing shipping method page will open.
  4. On that page open the Shipping charges tab.
  5. Select the desired location in the Show rates for location: box.
  6. In the Cost dependencies section, enter 0 into the More than $ input field and price for the first item (e.g. 4.50) into the input field next to it.
  7. Click the Create button.
  8. In the Items dependencies section, enter 0 into the More than.. items input field and additional charge for the first and each additional item (e.g. 1.50) into the input field next to it. Select the check box next to Absolute ($) in the row.
  9. Click the Create button.

    The shipping method is set up. For the mentioned example the shipping  cost will be $6 if one item is ordered and extra $1.50 will be added to  the cost per each additional item in case of 2 or more items.




    NOTE: This extra charge does not depend on the  ordering products. For example, if a customer adds the third product to  the cart and it is different from the first two, additional charge for  it will be $1.50 anyway.

Also there is an ability to define additional shipping  freight for a product which will be added to the calculated shipping  cost for each ordered item:

  1. In the administration panel, go to Products > Products.
  2. Click on the link corresponding to the necessary product.
  3. On the Editing product page open the Shipping properties tab and enter cost (e.g. 2.00) which will be added to the shipping cost for each additional product in the Shipping freight input field.
    NOTE: It is necessary to fill in the input field for all products that will have such additional shipping charges.



  4. Click the Save button.

    As a result of defining the shipping freight, the shipping cost will be $8 ($6 + $2) if one item is ordered and $3.50 ($1.50 + $2.00) will  be added to the cost per each additional item in case of 2 or more  items.