Hello, I'm using Joomla 1.5, and ARTIO JoomSEF v2.3.2

I have a joomla site with about 30-40 main categories and many pages underneath (online store)

Currently, using JoomSEF v2.3.2 and I think it's called Mambots.

What I want to do is be able to customize the title (<title>this title</title>) for 30-40 main pages. While the other few hundred product pages are auto-generated.

How can I accomplish this?