Unlimited Sub Categories?

[shortd81]

Is it possible to have unlimited Sub Categories:
Example
-1 (main)
-1.1 (sub)
-1.2 (sub-sub)
-1.3 (sub-sub-sub)
-1.4 (sub-sub-sub-sub))
-1.5 (sub-sub-sub-sub-sub)
-1.6 and so on?

[Ap0s7le]

Sure