I have iPhone 4 that I want to sync iTunes library to more than one computer (1 iMac and 1 PC). PC was previously synced with old device. I want to sync iTunes library currently on iPhone and override data on PC. How do I do this? I do NOT want iTunes library currently on PC and override iPhone.
Iphone will, and always has, only sync pics and itunes content to ONE computer. IF you sync to another it will erase the current content, then replace with content from the new computer.
You could however Transfer Purchases from your iPhone to a computer without syncing it, but that is just adding stuff from your iPhone to the computer and is not the same as synching. You can only sync with one computer.