Page model inherit from other Page model

I’ve a page model NewsPage which extends from Page, obviously. Now I want to create another Page model, which inherits from my NewsPage. I don’t know if this is possible, when I try to, I need to reference the NewsPage class before. So tried:

use \NewsPage
use NewsPage

but I don’t really know how to actually use it in my OtherPage model. Could someone please give me a hint?

The use statement with non-compound name 'NewsPage' has no effect

The FQN would be Kirby\Cms\NewsPage, so

use Kirby\Cms\NewsPage;