like putting a subforum within another subforum

[maomusic.net]

I have to forum vbulletin 3.6.7 I want to know if I can put a subforum within another subforum without it is seen in the first subforum… so that in the forum that I have when treatment to put a subforum within another one the subforum leaves to me in the first subforum and also it leaves to me within that subforum… and what I want to do is that nothing else leaves to me within the first subforum not in the two parts.

this was translated so that english does not speak

thanks for the help