The "Combine Shipping" setting allows you to configure how you want a product's shipping charges to be applied in the cart. You have the following options per product:
- Charge per item: Always apply the shipping fee for each item regardless of quantity or other cart items.
- Combined: this product: Apply the shipping fee once per product (a single shipping fee for multiple quantities of that same product).
- Combined: entire cart: Only apply the most expensive shipping fee of ALL products in the cart.