You will need to create a new Apple ID if sharing one on different devices.
See How to create a new Apple ID https://support.apple.com/en-us/HT204316
Keep in mind that some things available under the first Apple ID will not be available under the new Apple ID. For example, you won’t be able to transfer anything purchased from the App and iTunes Stores to the new ID. And, there are other issues to be addressed. See
what Eric Root say on this matter here: https://discussions.apple.com/thread/251169605 and
what Winston Churchill says about it here: https://discussions.apple.com/thread/7452747