Presenter '09 - add/edit slides after published

Hi all,

I need to add some slides to all of our published articulates.  I know that I need to do this to the original PowerPoints, I have those, but I don't want to mess up the audio that has already been done.  How do I add slides, and keep the audio that has been previously recorded?  I want to add 2 slides at the beginning, a slide before and after the quiz if applicable.  And a new slide at the end, all narrated.  I've been searching for a couple days now, but my search isn't working. 

Also, how do I add already narrated slides to a previously narrated course?  So, I am combining 2 published articulates basically.

Thank you!

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