Thank you for replying.
I am just using shipping as an example of my problem. There must be a better tool for helping you to find out what the different Shopify apps can do.
I have two shipping related problems. The main one is that we offer different shipping and collection options based on the delivery location. This also effects price.
We are suing at app that allows the customer to see what they will have to pay, but the system does not reflect these choices on the checkout page.
We have an advanced shopify subscription