Set your Source as a high enough 'level' so that all the folders are subfolders (or deeper) of that level. Then use the 'Choose...' button on the Simple settings page to de/select which folders (etc) you want as appropriate.
Bear in mind the Include New Folders (and ...Files) settings in that dialog and ponder over what behavior you might want in that respect...
Bear in mind the Include New Folders (and ...Files) settings in that dialog and ponder over what behavior you might want in that respect...