As adding new structure mother in the category to the forums?
 

Default forums is :
-- Forum
----Main Category
------Main Forum

url main forum is:
/forum/main-category/main-forum

I need add other forums mother in the category:
/forum2/main-category2/main-forum2

-- Forum
----Main Category
------Main Forum
-- Forum2
----Main Category2
------Main Forum2

Is this possible?

I also want to ask if it is possible to create sub-forums within a group?

--Groups
----Category
------Group
--------Sub-forum

ScreenShot:
https://vborg.vbsupport.ru/external/2013/07/21.jpg

Can anyone help?

I want to do this in order to have two sections of forums,
have 2 different buttons on the navbar and that each has different forums.

I don't think that's how the system is designed to wrok

But somebody may make a moificacion for this to work? I need a button on the navbar called championships and another button called forums.

can hide a category with css?, If possible this may be a solution.

Here in vbulletin.org have forums on "Forums" and "Mods" this is exactly what I want to do,

this is possible in vb5.0.x?

Sure, set the display order of the forums you don't want to see to 0, and then link to the forums you want to see directly. Same thing.

How? No understand..

Go into the Forum Manager, edit the forums that you DO NOT want to appear on the forum home, to display order 0.

Then, provide a link directly to those forums.

Ok, thanks, order 0 is to hide..

and to show other categories in another button of the navbar as I do?

Example:

Mods: https://vborg.vbsupport.ru/forumdisplay.php?f=198
Forums: https://vborg.vbsupport.ru/index.php

and a question.. How do to hide the sub-forums?
https://vborg.vbsupport.ru/external/2013/07/18.jpg

If you want o to hide the sub-forums you can try adding this CSS code to your themes css_additional.css