I have some artwork in an .ai file, but it's spread across many different layers. How do I safely migrate these layers to another .ai file with all of their attributes and proper layers intact? If I copy and paste, it just pastes it all into one layer. In Photoshop, you can select a bunch of layers, and drag and drop them onto another canvas. How do you do it in Illustrator? Any veteran vector artists wanna help me out? Thanks.