Is it possible to exclude specific categories from shipping options? Specifically we want to disable specific categories which are dispatched from a location that we can not express ship from.
Specific categories can't be excluded, but you can exclude at the product level. The way to do this is by creating a shipping category.
You can then add the shipping category to the options you want to allow (so anything but the express shipping). You can find this at the bottom of the shipping option.
Once that is done, you can then change the products in this specific location to the new shipping category.
There's instructions to perform these three steps in this article here: https://www.netohq.com/support/s/article/add-a-shipping-category