Official comment
Sub-folders are not yet supported in playlists from iTunes within the rekordbox tree, but if you use the Sync Manager, you will see them available:
iTunes:

rekordbox:

rekordbox Sync Manager:

Je reviens sur un sujet qui semble ne pas avoir été résolu dans la version Rekordbox 4.1.2 (Itunes Ver 12.1.4.6)
Je crée un dossier nommé "Dossier 1" et dans ce dossier, j'en crée un autre nommé (Dossier 2) dans lequel je place des playlists. Les deux dossiers se trouvent bien dans le fichier "iTunes Library.xml" mais pas dans RekordBox.
Est-ce que quelqu'un aurait une solution ?
Merci d'avance,
Sub-folders are not yet supported in playlists from iTunes within the rekordbox tree, but if you use the Sync Manager, you will see them available:
iTunes:

rekordbox:

rekordbox Sync Manager:

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I should also note that this was previously mentioned to the rekordbox team, but I've asked them to investigate again. Thanks!
OK thanks a lot for your trick ! It's all I need
Thanks