Q: removing photos from new mac book pro

Open photos and delete them. Photos has built in delete and trash

I'm not familiar with Iphones. So someone else would have to answer that question. As far as deleting them from the MBP. That should not delete from the Iphone. As then if the MBP was off there would be no photos on the Iphone.  http://www.idownloadblog.com/2015/02/12/how-to-transfer-photos-from-iphone-or-ip ad-to Read this and then go down to the bottom of the link and click on saving your photos. It may help.  https://support.apple.com/en-us/HT201317