How to manage sub-forums using alternate template ?

[infosys]

Hello all,

When i installed my forum, some time ago, i remember that i've succeed to create a new category, and all sub forums in this catefory was hidden from the frontpage. To view them, i needed to click on the category link, and then the new template appear with the sub-forum (like an real sub-forum, inside the main forum).

Like this:

Forum

Category1
sub-forum1
sub-forum2

Category2 <- need to click here to access sub-forum on new template !
sub-forum1 (hidden)
sub-forum2 (hidden)

And actually, i don't remember how i've done this through the adminCP...

Help :cry: