Is it possible to replicate sub categories quickly without having to physically type each one in the admin panel?

For example, what I want to achieve is the following:

Category A
- Sub category UK
- Sub category Eire
- Sub category Isle of Man

Category B
- Sub category UK
- Sub category Eire
- Sub category Isle of Man

I have searched the forum, but I cannot find any suitable threads.

Sorry if it sounds a stupid question - Links SQL newbie!

Any advice would be much appreciated.

Cheers