Switch AppleID
What is the most effective way to switch my Apple ID from one account to another on my MacBook Air?
MacBook
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Change Apple IDs on the computer?
Use the below as a guide of where to sign out/in.
What to do after you change your Apple ID or password - Apple Support
If you create/use a new Apple ID, you will lose access to some of your data and the purchases made with your existing Apple ID. If you want to have 2 Apple IDs on the computer, I suggest going to System Preferences/Users & Groups and create a new user account to use the 2nd ID in.
If I am misunderstanding what you want to do, more information would help.