So you should select Audiobooks, Books, i Tunes U, Mobile Applications, Movies, Music, Podcasts, and TV Shows. i Tunes now starts adding the content from the library on your computer to the new library on your network.
Step away from your computer and take a nice long break as the copying is likely to take a long time, especially if you have a large library. In File Explorer or Windows Explorer, open the i Tunes Media library on your network and make sure the folders and files for your music, apps, books, and other content are there.
The location should say: Media (assuming you used I as the drive letter for mapping).
Then check the two options for "Keep i Tunes Media folder organized" and "Copy files to i Tunes Media folder when adding to library." Click OK to close the Preferences window.
At the Preferences window, click on the Advanced icon.