ANOTHER preloader question

Well, i know every question theres is to ask about this subject has probably already been asked. But couldnt find the answer to this.
Ive made a preloader, following the tutorial written by Lostinbeta
(I think). Well im just wondering how i would go about when im going to add it to my swf’s. can i just put it all in mc? or do i put all those 4 layers in my swf’s?

thanx//