Including Folders in AIR Installer Files

I am trying to create an AIR Installer file through CS3 that has my assets folder included. What I need to happen is, when the AIR Installer runs, it needs to create an assets folder along with everything else, in that folder it needs to have subfolders with a few files in them.

At the moment, I can only add single files, not handy when I have images, music and xml I want neatly organised. I want to select whole folders to add, idealy just my assets, at the moment I can only add one at a time.

Can anyone give me a bit of advice on how I can do this?

Thanks for reading.