Is there a way to order my trees or have folders?

I have been writing online for years. I have lots of content on various blogs and mind maps that I am bringing to Gingko. And during this process, I have been making many new trees. I include some code in the name to help locate it later. And what could help bring order to this would be a way to put the trees in alphabetic order or better yet to have at least 1 and at best 2 levels of folders.