How do I setup my Element Types Sources for deep linking?
Your plugin has to create those routes &mdash; via registerCpRoutes() &mdash; to match your desired URL structure.

Routes either trigger a site template or a controller, as described in the Routing docs. (Craft's own internal convention is for CP routes to trigger a controller method, which sets up the request and renders your desired template.)

You can look at Craft's own CP routes for inspiration in setting up your own; they're defined in /app/etc/config/common.php.