Sure, they will accept it. You have to have good reason to do it though. Read their submission guidelines and you should find what you are looking for there. If not, let me know and I can pull them for you.
If the sub-page is worthy of it's own submission, it an be included. There are many sites with multiple pages in DMOZ. But if you just want to submit them in hopes of getting on in, don't waste your time (or the editors... there are big enough back logs as it is).