I am using K2 on a local Yellow Pages style business directory and as you can imagine, I have a large number of categories. I am looking to expand to additional cities and would like to add these same categories to each additional city. Does anyone know of an easy way (or a utility) that I can take several hundred categories in CategoryA and make a duplicate under CategoryB and so forth? I cringe at the thought of having to add them all by hand (again :) ) I have seen the "Copy" button within K2 but this obviously is not designed for what I am looking for. Any thoughts, suggestions etc would be greatly appreciated.

This is possible by importing them directly into database.

assume that the Id of CategoryA is A, and Id of CategoryB is B

Make sure to replace:
A with CategoryA id
B with CategoryB id
# with your database suffix

Great! I will give that a shot!