Posts to Multiple Pages

I have a wordpress site that is set up for a company intranet, where each of our departments gets it’s own static page, with sub-pages depending on need. I also have it set up so each department can manage their own page and sub-pages without being able to edit anothers. All the users and roles are segregated into these departments, so far so good.

I’m looking for a way to allow each department’s user to put up posts (like newsletter type information) that would appear on their department’s page once submitted. It there a way to have a page behave like a blog post?

Keep in mind I’m setting this up with the intention of each department managing their own content. There has to be an easy, almost any user can do it method of putting up a post on their department page. Any ideas?