Change FF Library Directory

Is it possible to change the tree directory to add/remove categories?

other than editing the filter, changing the name and adding to "my filters", I haven't come up with anything else.

I'd like a "Glass Category", for example and be able to move only the glass filters that I want included into that new category.

For now, I have renamed all the glass filters to begin with 'Glass' so that they are all together in alphabetical order.

I understand that I can use the 'search' function but not all the ones that I want come up and there are a lot that do not belong in that search.

Any help at all is appreciated.