Deleting pictures in a slideshow.

An Apple Photo Support person called and told me what to do. He said that just deleting an individual picture using the command>delete function WILL delete the picture from each and every album that this paticular picture may be included in. It will still be in my Photos Library. This is what he said to do, and this works as I have already done this anad checked to make sure it works. Within the album that I want to work with, click on the picture, or even multiple pictures that I want to delete from this specific album. Then go up to IMAGES in task bar and drop down till you see "delete this pic from this album" it is the last option. It will say "1" or as many picture as you have chosen. Click on this and that picture will ONLY be deleted from that specific album. Thanks :))

Thanks, my Iphones have taken many really beautiful pics. I am NOT tech familiar at all, I work in the OR. And these pics are precious to me. I appreciate your answer. Thanks