Can I select which photos to store in icloud
can I pick which photos are stored in icloud
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Sorry, no. It is all or nothing but you can reduce the amount of space needed on your iPhone.
Also, you can make the suggestion to Apple that they add that option. See: Feedback - iCloud - Apple
iCloud Photos is a syncing service. Any photo you delete from a device where iCloud Photos is turned on will also be deleted from iCloud and from any other device connected to iCloud Photos. You can potentially reduce the storage space required on a device by turning on Optimize Storage. See: Set up and use iCloud Photos - Apple Support
Apple does not currently offer cloud-only storage for photos. If that is what you want or need, you may want to explore 3rd party options such as Google Photos or Dropbox.