Your question isn't very clear. But if you have 2 copies, one on the phone and one on the SD card, and you delete one of them the other should still be fine.
If you only have the one copy and you delete it, it will be deleted, because you deleted it.
Are you saying your photos are saved inside another file, kind of like how a zipped file works? And are those the photos you want to delete instead of photos saved as independent files?
I agree with the others, we head more information to understand exactly what you are asking. Otherwise, any answer is just going to be a shot in the dark.