Anyone know if there are any mods in which allows Sub-Forums to be created within?

[Viceroy]

I am wanting to find out if there are any mods in which allows for Sub-Forums to be created within Sub-Forums and have it appear as a Child Forum / Sub-Forum link under the description of the Sub-Forums, for example on the Index Forums within any mods applied we can already control the depth of how many sub-forums appear but I want the same for Sub-Forums within Sub-Forums. Any idea's?