I'm creating a database of companies in music. Each company is a category, and the information about the company is listed in the category. They need to be categories because I will be having posts written about products that the companies release. Basically I want to be able to list categories based on where the company is based so that people can search for local companies. Something like tagging category pages would be perfect here, but as far as I can tell isn't possible. I will then be allowing people to search companies based on the company location through a series of drop down menus, similar to what you would find on a job search site, or something similar.
Any suggestions on the best way to go about this?