Making a Sub Forum, within a Sub Forum

Why can't i set a Sub Forum within a Sub Forum?

All i seem able to do is one Sub Forum down.

That's all you can do, I think.

You can use forum catogories though.  So for example I've got a forum category called "Raiding" that people can post in for conversations generally about raiding, but then there are sub-forums of "boss tactics" and "guild raids". 

It may just be a matter of coming at it from a different angle.

Sub-sub forums would be a super handy feature, I think, but it looks like you just need to be a little creative with your forum/sub-forum set up for now.