How do I switch an iMac from a personal Apple ID to a Business Apple ID (not created yet)?

Hello swooks33,

You would simply sign out of your personal Apple ID and sign in with your business Apple ID. This is explained here: Sign in or out of your Apple ID on Mac - Apple Support. Follow these steps:

"Sign in with your Apple ID

1. On your Mac, choose Apple menu > System Settings, then click Sign in with your Apple ID at the top of the sidebar.
2. Enter your Apple ID and password, then follow the onscreen instructions.

Sign out of your Apple ID

Sign out of your Apple ID account to prevent others from accessing your account information and Apple services on your Mac—when you sell or give away your computer, for example. See the Apple Support article What to do before you sell, give away, or trade in your Mac.

1. On your Mac, choose Apple menu > System Settings, then click [your name] at the top of the sidebar.
2. Click Sign Out.
3. Follow the onscreen instructions for copying and downloading your data stored in iCloud. For more information about signing out of your Apple ID, see If you sign out of your Apple ID settings."

For help with creation of a new Apple ID, see this page: How to create a new Apple ID - Apple Support.

We hope this helps. Let us know if we can assist with anything else at all. Take care.