KIA subtitle allows you to easily add a subtitle to your posts and retrieve it in the loop in the same manner as the post title. By using the_subtitle() or get_the_subtitle().
It adds a simple input field right under the title field of posts, pages and any custom post type. It also add a subtitle column to the edit screen as well as to the quick edit.
You can also use the shortcode to display it within the post content.
KIA Subtitle has been tested by WPML and will allow you to translate the subtitle multilingual sites.