How to make another bootable linux partion / installation on the same disk

[Hanasaki JiJi]

Some time ago, I was told that the easiest way to make another 
installation of linux - on a diff partion of the same disk, was to 
format the partition, copy the existing (and working) linux install 
partition over to the new one (cp -r / [tmpMountOfNewPart) and add an 
entry in lilo.

Well...I tried that.  :(  When I rebooted, the kernel on the new partion 
said unable to create a console and paniced trying to kill init. 
Someone said its related to /devfs ? ???  Any thoughts or input?

What isa good way to accomplish this w/o doing all the installs on the 
new partion?

Thanks.