Assuming that you are referring to is the business code. You can select Look up my business code on that screen and TurboTax will give you a list of business categories on the right that you can choose from. When you select the business category, there will be a list of business codes, so choose the one closest to the type of your business.

Review the TurboTax articles Reporting Self-Employment Business Income and Deductions for more information on business deductions.
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