HT201250 How to migrate backup disk to new computer using mountain lion?

The page says it provides information about how to migrate a backup disk to a new mac, but it's not there.  Does anyone know how to do this in Mountain Lion?  When I simply chose the old disk on the new computer, it created an entirely new backup folder and was going to back up everything, not just add to the existing backups.  The computer name, login name, and login password are not changed.  It's just a new machine . Both old and new machines are mid-2011 iMacs.  Thanks!

If it's a new machine, then Time Machine will make a new backup. This is how Time Machine works. A new computer always results in a new backup.
But your question seems to ask about how to use Migration Assistant to transfer your Time Machine backup to the new machine. Am I misunderstanding your question?
In any event: Please visit Pondini's Time Machine FAQ for help with all things Time Machine.

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