Hope everyone is well. I have a question. I am trying to add a custom column into the address sublist on a customer record. This column would contain a custom field. Anyone know how to go about this through the UI? Or is this something I’d be better off scripting?

I do not think you can do this without scripting. There is no native option to get custom fields from the addresses.

Correct, it cannot be accomplished through configuration in the UI. You would need to script the form to add the column to make it visible in the list. (There are some address validation bundles which show custom columns, and this is how they accomplish it)