Hi Dalene,

You didn't indicate which version of PhotoStory that you are using. I have 2013 and the following method is probably the same in other versions.

There are 2 ways. One is to treat the image in a photo editing program.

The other in PhotoStory is to:

1. Switch to the timeline mode
2. Bring in the image onto track 1
3. Make a copy of the image, Ctrl mouse left button and slide to the right, or bring in the image again after the first one
4. Select the first image
5. Go to Effects, view & Animation, Section
6. Open the popdown below width and height and select free proportions
7. On the image, drag the right towards the right to show only one person
8. Click on Size & Position and drag it to the centre. If it went crazy, click on Center and Maximize. You now only see one person
9. Select the second slide, go back to Section and drag the dashed box to the right to show the other person or do Center and Maximize
10. Click on Size & Position and drag it to the centre. You now see only the second person
11. Drag a third image onto track 1 after the second image

You're done unless you want something fancier, like having each side fly in from off-screen. In that case, start by noting the coordinate of the left of each part of the image after doing the section, and the width. then you have to copy the first modified image onto track 1 and the second below it onto track 2 , move them off screen and key frame each to fly in. This is more complicated and requires knowledge of key framing. Let me know what you want to do.

Good luck!