Are you clicking the New button on the toolbar when adding new expense codes? If you don't click the New button first, then you'll be overwriting the existing expense category with a new one. All expense categories that appear in the AFE/Expense Category screen should be available when entering a bill by clicking on the Code button during data entry.
You can add expense categories under Maintain > AFE/Expense Categories. Note that expense categories are not a chart of accounts. They are just a detail listing of expenses. You can add an account to your QuickBooks chart of accounts in QuickBooks.
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