Is there a setting on custom records to allow the joined sublists to be updated on the same CSV Import? For example, I have a custom record 'Sanction Entity' that I want to import, and it also has a sublist 'Sanction Entity Address' that contains all of the known addresses for that entity. Right now, I have all of the child/parent settings and it shows up correctly in the UI, but the 'Sanction Entity Address' sublist fields aren't available on the CSV import screen when i'm doing an import for 'Sanction Entity'. Ideally I want it to look like how it does when you upload customers and upload an address sublist along with it. I'm not sure if I missed a configuration, or if it is not possible without scripting.

I'm gonna guess your SOL, according to this page there is a set list of what sublist types are supported by this type of import Supported Sublist Imports

awww dang it... thank you