Disk Utility says "no options" when I try to partition

Hi,
I have a flat-screen IMac G4. I want to partition the hard drive. When I open disk utility and click on the drive I want to partition, I get the partition tab, but everything is grayed out and it says "no options." Can anyone tell me how to proceed to partition? I want to restore another, smaller hard drive on the IMac, hopefully without erasing everything. This would be sort of an archive of the hard drive that's already on the IMac. It's old stuff that is not currently in use.
Any help is appreciated!
Thanks

You have to boot using your install disc. See http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh14.html
You posted in the OS 9 forum. You should post in the iMac or Tiger 10.4 forum. See http://discussions.apple.com/index.jspa?categoryID=1
 Cheers, Tom

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