How do I create a new Apple ID within our existing family account?
Right now my health data is pulling “steps” from other devices in our family. I want to make a separate apple id for just my phone
iPhone 13, iOS 17
You should not be sharing an Apple ID for any reason. Family Sharing works across different Apple IDs for different people. There's no reason to be using the same one for anything.
To create a new one, follow the steps in the support document you posted from. It tells you exactly what you need to do, to create a new account.
Then sign in with it in your iPhone in
Settings ➜ Apple ID (scroll to the bottom to sign out)
Settings ➜ Apple ID ➜ Media & Purchases
Settings ➜ Messages ➜ Send & Receive
Settings ➜ Facetime ➜ Caller ID
Do note, any Apps downloaded with the previous Apple ID will be forever tied to it, and will always require it to update.