Currently Being ModeratedDec 4, 2012 10:40 PM (in response to mattswife)
You can do this in 2 ways.
1) You can enable the sidebar and you can drag and drop like you used to be able to. To turn on Sidebar in iTunes 11, go to View > Show Sidebar
2) Another way is to connect to your Home Share from the drop-down menu from the left (where it says Music) and select your Home Share. Once you are connected to your Home Share, select Music and you should see a button that says "All Items" and on the right, you should see the Import button. To copy, select the songs you want to import and then click on Import.
Currently Being ModeratedDec 5, 2012 7:47 AM (in response to mattswife)
I seemed to be having the same problem. I recently updated all computers to iTunes 11. I could see the other libraries etc. but could not drag any songs to or from the other libraries. Because of this I thought Homesharing was turned ON for my computer. I stumbled upon Homesharing in the drop down menu "File" for iTunes and then selected Home Sharing- Turn ON, entered Apple ID and password. Now I can drag and drop songs just as I did in iTunes 10. Hope this helps.