Custom post type parent

Hi guys,

Question: I’ve made a custom post type called ‘Work’. The page that is showing these custom post types (page-work.php) displays my portfolio, and when I click on an item, it opens single-work.php. This page’s parent, however, is index.php, not page-work.php.

Is there a way to make page-work.php a parent of single-work.php? Am I making any sense?

Thanks,
Jeroen