Apparently, one piece of online folk wisdom goes as follows: If you’re having trouble with your Apple ID, just create a new one and abandon the old one. This actually isn’t a good idea in most circumstances. It usually makes a bad situation worse.
Apple IDs can be a problem, especially if you have legacy accounts from pre-iCloud Apple cloud services. Apple has made it easier over the years to use one Apple ID for purchases and another for iCloud, which was a big help. The upcoming macOS 10.15 Catalina rejiggers account management so your various Apple IDs are consolidated into a preference pane that replaces the iCloud one, very similar to iOS’s Settings app.
If you’ve wound up with multiple Apple IDs because of this advice, you can simply stop using those accounts or use Apple’s process to delete them. Any associated purchases will be lost, and Apple still lacks any way to transfer or merge purchases with another Apple ID account.
Read more at MacWorld.com