add multiple folders including subfolders/songs to playlist

Hi,

I want to add folders incluiding songs and subfolders to a playlist.

My folder structure is like this:
Share
|
-A
|
-song1
-song2
-…
-Artist1
|
-song1
-song2
-…
-Album1
-song1
-song2
-…
-Album2
-…
-Artist2
-…
-B
-C
-…

If I select a folder and add to playlist only the songs in the folder are added but not the ones in the subfolders.

Is there a way to do add complete folders to a playlist?

Thanks for your help.

Regards
Tuk