Thanks for replying ZipedX, I'll try to explain better...
I am developing an app for the iPhone and I am currently working on the artwork in Photoshop. I downloaded a PSD from Pixeden which has images of different iPhones with the screen at the same resolution as the actual iPhone. Which means I can place my artwork on top of the iPhone, clip my layer by the iPhone's screen layer and it looks as if my artwork appears on the iPhone screen. The PSD has multiple images, some of which are different models, different colors and in both portrait and landscape view. So, I can see what my artwork would look like on the different screens.
The trouble I am having is that when I want to see what things looks like on a different iPhone, I have to drag my artwork layers (all in a single group) to a different layer level and move the artwork around on the screen to position it properly. It would be wonderful if there were a way for that to be done for me automatically. My thought of how that may work was if there was such a thing as a layer "alias" or "view" (my guess at the terminology) so that as I make edits on one layer, the same changes would appear on another layer. I'm guessing a feature like this doesn't exist, but I thought I'd ask. Is there any other way to make this easier?