Tell us what you are trying to do?
I have added a custom User field, of type Select, named Country (meta key=wpcf_country). Now I simply want to bulk upload the list of 193 countries via CSV.
After, I would like a fast, reliable way to upload the Spanish and German translations (via WPML)... .mo files?
Is there any documentation that you are following?
I am trying to find the current best practices recommended by Toolset, based on the multitude of CSV Importers available, both free and those recommended by Toolset (which are over 5 years old and only tested up to WP 3.7.31 according to https://wordpress.org/plugins/csv-importer/?!) and conflicting solutions in the Toolset Knowledge base. Some solutions in the Knowledge base appear to be old. Sadly in the amount of time I have spent searching around, I probably could have added them all manually by now via the GUI, but nevertheless, we may come across this issue again, so I would still like to know the current preferred method.
Is there a similar example that we can see?
This must be asked by all your customers who use directory/classifed sites I imagine?
If you have a Country post type and you just wanted to fill the country select dropdown options dynamically, then you can use the Types hook: wpt_field_options.
Actually - its depends on your requirement, how you setup the country entity. If you want to connect the things later on using relationship, it needs to be setup as post type, if you just want to attach the country to your user, you can go with custom user field.
However, if you are going to buy the import plugin, with that, you need to setup it up as post type. I suggest, you should check for both first and run a test and chose the best suitable option later.