I'm unclear whether you're referring to QuickBooks or TurboTax Desktop, but I recommend keeping a consistent tracking of your business expenses throughout the year before tax time, and the system you're describing above is usually known as the general ledger expense accounts. The ledger is maintained in QB (or other bookkeping platform), and you would be able to reference your chart of expense accounts before "booking" a current expense.
A key strategy to avoid IRS scrutiny over business expense deductions is consistency in your reporting.
Learn more about expenses and accounting methods for starting a business (TurboTax FAQ)
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