https://support.apple.com/en-gb/HT205703
Optimise section is what you want.
How do I delete photos from my phone and retain them on the cloud, also how do I retrieve them when needed?
If i selected a photo on my phone and choose delete it says photo will also be deleted from the cloud, I thought the purpose of the cloud was to be able to free up your devices storage whilst retain the original.
TIA from a iphone newbee.
Cheers,
Ben
..... for I have become the Jedi of flippers
" an extravagance is anything you buy that is of no earthly use to your wife "
https://support.apple.com/en-gb/HT205703
Optimise section is what you want.