Ok... I found out that making a subdirectory makes a new bag... cool, I thought.
I'd like to get the letter tokens out of the main token box... but when I move the image files into a ../tokens/letters/ directory. I reload FG and bam, they're still there! Is there an xml file I should edit somewhere that will keep it from loading them on the top level box? I'd like to have the top level only have bags honestly.