A not real "Child of board"

[albataur]

Hi,

I don't think this feature is already available.

It is a child of board but which is not like a new board into an existing board.
It's a kind of category for topics.

For example :
I have got a board about "Your pets". There is three "categories" in this board : "Dogs", "Cats" and "Birds". When someone wants to create a topic about his pet, he can (not must) choose a category.
If you click on board "Your pets", you see all the topics. If you select "Cats" you see topics of "Your pets" but only about "Cats".
Here is an example : hxxp:forum.hardware.fr/ [nonactive]

I find its very useful because it allows to sort topics within multipling boards.

What do you think about this ?

Thanks, bye.