Hi i was wondering if anyone can help me to sync music from another library to a current one without deleting exisiting music?
You can only sync to One iTunes library at a time.
Why are you trying to Sync to a different Library...?
You can only sync with one iTunes library/computer. However, you can manually manage music and videos among different computers/libraries. See:
Using iPhone, iPad, or iPod with multiple computers
ok thanks dude u helped alot
Retrieving data ...