plan price based on country

I want to create a plan with tiered pricing based on the country selected, modeled after the UN's Human Development Index,  like this plan .    I created a plan with the highest price and created a custom field for the country.   It's a single select list field, listing all the countries as values, with all the fee values individually listed for each country.   It works, but it's has a drawback.   The state field isn't keyed to the country any longer.   I'd like it if the provinces of a country would load based on the choice of country.    Is there a better way to implement this?

Hi David

Unfortunately, right now, it is not supported. So if you create a list field to allow countries like that, maybe the province field could be a simple text field instead of a dropdown

That would be the easiest option

Tuan