If you took all the photos you want to link in the same cemetery family plot or they are a family group in a row, you should be able to link them directly.
If they are not on the same monument, stone, family plot or row, you should not try to link them as the GPS mapping will be incorrect.
There is a rather labor intensive way to group images that will not link after the fact, but truthfully it is not an easy process for beginners. If you really want to try it, it is called "fake merge" and several posts are in the Community describing the essentials of the process. If you are not sure how to do it, don't. Just transcribe the separate people, and you can always put the relationships in either in notes or elsewhere in the record.
Please reply back on this thread if you need more help.