one way would be the manual way ... open your file, choose the crop tool [C] in the tool workspace you can enter what size the final document should be or just follow your grid if you have one. press "enter" to finish your cropping - print the result. Press ctrl+z to undo the cropping and repeat process for the next area.
If you have InDesign you can just place the same image on several pages Letter/A4 and move it around within the frame.