Bulk Dublicate Category Tree?

[csho]

Hello,
i have a set of categories that i want to dublicate under a new root, is there any easy way to do this?

E.g i have ProductType1
                                     |_ CateogoryTree1 (many sub categories)

E.g i want to have ProductType2
                                     |_ CateogoryTree1 (with same many sub categories but empty)

I know this way is not the most efficient the site i am working has this already done for all of their product types and they want to add a new one...
I thought i could do it with raw sql but i beilive it will be such a mess.