Sorry perhaps I am a little greedy, I notice their is a parent and child (sub) forum. I am thinking of more of a multi level forum. I wonder can this be configured?

For example

Computer forum

(Child includes)

Acer

   (grand child includes)

    Laptop, 

    Netbook,

    Desktop,

    handheld

Apple

   Iphone

   Itouch

   MacBook

Lenovo

Something to that effect, Thanks for answering my queries.