how to make this Polaris multiple select component

[halild]

Hi,

I am building an app and I need to put a multiple select country+state selection in there but I could not managed to get which polaris components are used to do 2 levels nested selection for country+state but inner level is optional.

This is what I have now, which is single level;

I want to do like exactly in shopify shipping page config as below;

[remy727]

You need to build a custom component using the Shopify Polaris Checkbox component.

I built the similar one before and I created the public gist.

Hope it's helpful.