This is in relation to a previous request: https://help.useresponse.com/topic/can-we-have-category-hierarchies-group-categories-or-make-sub-categories
Sub-categories are an important feature for us also.
We have sub-categories in our wiki, and also something that is common across most support/help pages on other sites.
Because there can be over 40 categories to lump topics/tickets into, it's hard to expect the user to add to the correct one, and then search is a problem also.
What we envision is a client submitting a ticket/topic/idea to a top category , lets say;
These categories should have large icons/images also.
Then we take the ticket/topic, and attach a sub category to it.
So It could live in something like
Creation > Charts
Creation > Connections
This way the user can still choose a category that makes sense when creating, and if they choose to browse existing posts/articles, they can be assured that everything in the 'Charts' category is relevant, as we put it there and maintain it.
Attached are some examples;