I haven't done this in awhile, but it goes something like this: GO TO THE INDIVIDUAL with the photos, and go into their photos. Click on the photo and them remove the individual from the photo by clicking the redX. The photo will remain in in your photos pool for your tree, but you will get a prompt to attach it to another person. You then attach it to the same person. The hardest thing is getting the sequencing correct. Once you get the hang of it you will figure out which photos you need to do this for and which can remain untouched.