I've recently moved from Premiun to Family Plan and have the next question:
Can I MOVE some playlist from my account (the main one) to my wife's or son's accounts? Not just share the playlists, but move them...
Did you ever figure it out? I am in the same situation.
Thanks for reaching out to us about this.
The easiest way to go about this is to follow the steps in this Spotify Answer to transfer your music over to a new account.
Let us know how you get on! We'll be here in case you have any further questions about this.