How to merge iTunes libraries between users
November 7th, 2008 by Donald Bell
Let's back up your current iTunes library. In iTunes, go to the File menu, highlight Library, and select "Back up to Disc".
Keep in mind that the backup process will copy all your iTunes content, including iPhone applications, audiobooks, games, movies, music, music videos, podcasts, ringtones, and TV shows. If you have any content you don't care about taking with you (do you really need all those old podcasts?) delete it before you waste your time backing it up.
hey followed all the steps have the m4r files sitting in my ringtones folder on itunes- but even after i have synced phone they do not appear on phones ringtone list...... HELP????? 
Peter V
November 7th, 2008 at 3:22pm
The only other catch is that this is only for a PC - although the name of this site is Applesource - Doh!
Al Prebus
December 29th, 2008 at 12:58pm
Does iTunes retain the new location of the master library the next time iTunes is restarted?
Katherina Sage
January 5th, 2009 at 1:33am
Does this method to merge iTunes libraries between users preserve Playlist Folders and Playlists? I have used this extensively in 3 user accounts on a PC (running Windows XP). I would like to consolidate the 3 libaries but retain the Playlist Folder/Playlist structure. Any help and input appreciated. Many thanks
Larry
March 9th, 2009 at 2:53am
How can I merge iTunes libraries from both computers in my home onto one library so I don't have to repurchase songs?
les
January 3rd, 2010 at 3:29pm
This did not work. I kept getting a error message that the new library was locked and the user did not have write access