I have a couple of panoramas that I want to print. One is 5" x 24" and the other is 3" x 24" both at 300 dpi. Is it possible to 'stack' them one above the other so that only 24 inches of paper is used? Then I could just cut away the unused paper? I'm trying to find a place that will do that. I'm a little new to the printing end of things.
You probably need to stack them yourself. For example, you could create a 18" x 24" canvas and put two copies of the 5" x 24" and two copies of the 3" x 24" on it. Then have the 18" x 24" file printed.
Just do it in Photoshop. Be sure the files have some trim guides between them in case it's hard to see where to cut. (Just a very thin black line works.)
Customers do that all the time to get multiple copies of the same print or several different prints on one larger print. Most people trim the print on their own once they get them.