I was confused. You posted this in "Mac Classic System & Software." It didn't occur to me that "Disk Utility is an OSX app. If you boot off your OS 9 CD you'd use "Drive Setup" in the Utilities Folder. Since you're running the system off the CD you can now partition the internal hard drive. It will, of course, wipe the contents of that drive.
As far as doing it with OSX, I don't know. If you had another bootable drive to hook up to your laptop you could use "Disk Utility", but I'm not sure with the OSX CD. Sorry.