Hi,
We are trying to figure out how to add a custom shipping rule for a specific product/carrier. Namely, shipping upcharges. For example, we have products that require an additional $5 fee for priority shipping and additional $10 fee for International. How do we go about applying this? We have thought of a few ideas:
1) Create a custom carrier for each possible upcharge amount. Although this is technically possible, it is not very manageable. We would simply like to add upcharges based on product/carrier choice, not create new carriers for every combination.
2) Create a cart rule. This almost works, if cart rules would allow negative values. Cart rules seem to only apply to discounts, not additional charges.
3) Buy a module. We have not found a module that covers this requirement.
Ideas?