Hi,

I'm very happy to release my new product to allow having chained or dependent fields in K2, it is available for J2.5, and will support J3 very soon.

With this new package you can created field pairs like country/city, where the city select field is updated automatically upon changing the country select field.

You are welcome to have a look and let me know your thoughts
www.joomreem.com/extensions-store/item/53-chained-fields-for-k2.html