Can't Access Sub folders via 4.30

[RESRam]

I just upgraded to version 4.30 and can't figure out how to access my sub-folders to select from only the sub folders when creating my play list.
I have sub files listed under the main file "Karaoke Songs" on an external hard drive. The sub files allowed me to organize the songs into various groups, i.e. Duets, Broadway Songs, etc. and are named accordingly.
Right now, every song within the main file is listed in the "MY Songs Window", instead of allowing me the opportunity to only show songs within a particular sub-folder. I went to the manual and followed, I thought, directions and checked "Subs" next to the main file Karaoke Songs. Help. Thanks.