dropdown menu and add on in posts

Hi there,

I have a problem by adding a dropdown plugin for my blog.
There are two things in this.
I write blog about mobile phones and have a menu bar in the header, where all the brands are represented (eg. Nokia, Iphone, Samsung..). but in this menu bar I want to have a dropdown, where the models of that brand appears (say it’s nokia then I want the roll over dropdown to show ‘Nokia E7’, ‘Nokia E72’, ‘Nokia E71’ ect.

The menu bar is grouped as ‘category’, so I wonder if you can make an under category where it is possible to create the model.

so basically, I want to be able to write an article that I put under the category (Nokia) and then put it under a sub/under category (model)

When I then go to my blog, I would be able to roll over the menu called Nokia and then a dropdown appears where I can choose the model I want to read about.

I tried to sketch it as good as possible, but if you are in doubt of what I mean, please do not hesitate to write back ??