I appreciate you for clarifying the issue, @ebuhrendorf1.
Adding new kinds of Detail Types in your Chart of Accounts is unavailable. You can use the default ones in categorizing your accounts.
You can change the detail type of an existing account as mentioned by my colleague. However, doing so may affect your business accounting and reporting.
If you still want to update your account's detail type in your Chart of Accounts, I'd recommend consulting your accountant to keep your books accurate.
To learn more about how to use detail types for your Chart of Accounts in QuickBooks, kindly refer to this article for the detailed information: Learn about detail types in chart of accounts. It also contains an explanation of what detail types to use when adding a new account.
Please let me know if you have other concerns. I'm just around to help.
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