WordPress post – a few pages

Hi all,
I want create new post (which style is defined ind single.php), but i want, this post got a few pages, for example, i create article – xxx, adress : mypage.com/category/xxx . I want, this article got 4 pages : 1st of them (default page of article) it`s mypage.com/category/xxx , 2nd page : mypage.com/category/xxx2 , 3rd: mypage.com/category/xxx3 , 4th: mypage.com/category/xxx4 .
How can I do it in wordpress? Do you know plugins for it etc? Is it avaliable, or I must change single.pl and database?