How to split a macOS account into two

One of macOS’s most beneficial features—and its biggest change from pre-OS X versions of macOS—is allowing multiple users to have unique accounts on the same computer. Sometimes, however, you might decide only after creating and using an account for a while that you might want it split into two or more macOS logins. .

Perhaps you have an account in which you mixed personal and business purposes and decided that needed to be separated out.
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