How to add multiple layers and make them fit

I'm making ID badges. I have made a template for the artwork and then added each photo individually to a box sized area. The images are already cropped to squares, but I had to resize each one to fit in the box. Then I have to make each one visible in order to save all of the images of the IDs.

I'd like to be able to add a group of images (all square) as layers to a pre-defined area and have photoshop resize each accordingly. It would be great if I could batch save the images, too and not have to hide each successive image.

Thanks for considering my request.

It can be done. Look up Variables and Data Sets in the help files.