selct the playlists you organized or if it's only tracks, selct all and right click, choose "export" to your usb drive
keep in mind you will now only be browsing the info you set in RB, if you choose to browse the tracks in the folders of the usb drive, you will not see the analyzed data, exporting the way you are trying to do this will duplicate every track on you drive now. you will need to re-created the exact folder structure you want by now creating playlists in RB and exporting them