At the moment the site uses weight based shipping with all products set to "1" and samples set to "0.01", this makes it cheaper to order samples and everything else is a standard charge.
The client now wants to split the products into 4 different groups and charge shipping based on the manufacturer of the product.
Hi, while it's not possible to specify a shipping rate based on manufacturer, you can go into those products and add weight so the shipping increases for those items.