The Reporter software does not start with a pre-defined list of categories, but builds this list up as it processes each access log. If none of your access logs have shown a category, it will not show in the drop down list as a category to filter on. In other words, some less uses categories, may never show in this list, because no one from your organization has visited a website with such a category.
To access your list, follow these steps:
Login to Reporter with your user id.
Load your chosen database.
Run any Reporter.
Click on "Report Options"/
Use 'Add criteria' to add in the category filter.
On the right, click on the drop down, to see the list your Reporter server has.
Here is the list of categories from a single access log: