Hi, my new iPad is my first ever iOS device. It's a lot of fun. I'm having trouble with using iTunes to sync my movies. I want to delete the movies from my PC after I transfer to my iPad. But I get a warning from iTunes that if I delete it from my library, it will also be deleted from the iPad at the next sync. I want to keep syncing to transfer more movies from the PC to iPad. How can delete old movies on my PC without iTunes also deleting it from the iPad on syncing? Thanks!