I agree with Susan that sub-categories under a sub-category is not a good way to go in most cases.
I just looked at a couple of past challenge post threads. The July sketch challenge had 26 posts but only 7 of those are layouts. The August palette challenge had 12 posts with only 6 being layouts. It would take quite a while to fill those categories up so they wouldn’t be too bad to go through.
The only sub-category that I could see having a sub-category under it would be the tut/tech challenge since each of those are different themes. That way if someone wants to look up layouts pertaining to just a tut on multi-colored text, they don’t have to go through the watercolor tut to get to them.
