I want display only that manufacture' category at sidebar.

At Virtuemart, I want display only that manufacture' category at sidebar. How can I do this?

For example:
Manufactures: BMW, Toyota, Honda, Volvo, Ferrari ect..
Categories: SUV, MPV, Sport, ect...

Let say both BMW, Toyota have the same categories.
So I want to display when the user select Manufacture as BMW , it only come out all BMW belong Categories and only display BMW products.

Do you have any ideas for this?

My temporary site: http://samhoikl.com/amberbrooktoys/

I think my question is not clear. So I have modify my question and make it more clear what I need.

Basically I need something like below:

For Example:
Manufacturers: BMW, Toyota, Honda, Volvo, Ferrari ect..
Categories: SUV, MPV, Sport Car, ect...

Let say both BMW, Toyota have products at category called "Sport Car".
So I want to display when user select Manufacture as BMW, it only show out all BMW products at "Sport Car" category, I don't want to display Toyota Car.

Do you have any ideas how to do this?

Hi

I'm sorry, but we do not have an extention which can do that. Please maybe ask on VM forum. Users they may advice something.

Anywhere, Thank you.