Changing ward budget categories

Am having trouble figuring out how to add and delete budget cateories (not just subcategories). For example, I'd like to get rid of "High Priests," and add a "YM/YW combined activities" category. The only options I can find are to add (or inactivate) subcategories within existing categories. Can anyone help me?

The system doesn't allow you to add or remove the top level budget categories. You can only add or remove sub-categories.