hi if i delete photos from my iphone will they remain in the icloud?

Get help with your iCloud Photo Library - https://support.apple.com/HT204570

iCloud Photo Library - Apple Support - https://support.apple.com/HT204264 - FAQ

"How do I delete photos and videos from a device using iCloud Photo Library?

If you want to remove photos and videos from all your iOS devices, your Mac, and iCloud.com, you can delete them in the Photos app.

When you delete a photo or video from your Photos app, it also deletes from your iCloud Photo Library and iCloud storage. You can recover your photos and videos from the Recently Deleted album for 30 days."

You cannot with iCloud.

iCloud Photo Library is a syncing service. Any photo you delete from a device where iCloud Photo Library is turned on will also be deleted from iCloud and from any other device connected to that iCloud Photo Library. You can potentially reduce the storage space required on a device by turning on Optimize Storage. See: iCloud Photo Library - 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.