I am looking for a way how to add pages on top of each article

Similar to how task is structured, you have pages like Description, Timesheets... etc 

so I need to put 3 tabs on top of each article - which would display different articles within the one article

i know this article is just a html body field, but i dont know how to structure the view to be able to switch between multiple html body fields ... 

any clues ?