How do I dual boot Mountain Lion

I recenetly purchased a new iMac with Mountain Lion installed on it. My previous Mac runs Lion. I still have a few apps which I need to support older devices for and need to run an earlier version of xCode than is allowed on Mountain Lion. My hope was to setup a dual boot system with both Lion and Mountain Lion to do this. So far I have not been able to figure this out. I've tried to follow walkthroughs on the web, but they were all had Lion and were making a Mountain Lion partition. Any input would be much appreciated.
Thanks,
Scott

Yep. Your new machine can only be started with the version of Mountain Lion with which it came.
There isn't much you can do. If you wish to spend money you can purchase Parallels 8 for OS X and try running Lion or Snow Leopard in emulation. See Running Lion as a Guest OS in Parallels Desktop 7 - YouTube.

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