While you can certainly set up a single product with a shipping rate, we find that it is not very useful. The problem is that if you only have a few items using Better Shipping, if a customer puts one of those items in the cart, along with one of your other items that are using your current shipping rates, at checkout, the customer won’t see a ‘combined’ shipping rate. They will see two shipping rate options at checkout, one rate for the Better Shipping item, and another rate for your current shipping rate item, both of which will only be half of the shipping cost and they will be able to choose which one they pay. Unfortunately, when using Shopify different apps, and rates can’t produce a ‘combined’ shipping rate, unless all the calculations are controlled by a single app.
If you need a single ‘combined’ rate at checkout, you must use a single app for all calculations. Better Shipping has ‘per product’ shipping, along with price/weight based shipping rules and zip code features.
If you believe you still need to use this feature, please email us at firstname.lastname@example.org, and we can activate it for you.