Board Thread:Support Requests - Getting Technical/@comment-26347760-20150621220703

I admin the lovecraft wiki and I've run into an issue with categories. There are a large number of articles that have an incorrect category. I need to make sure all the members of the current Category:Characters end up labeled as Category:Characters appearing in the Cthulhu Mythos.

Is there an easier way than to go into each article, one at a time, and change the categories, or is there a tool to change a category and populate up the chain? 