Please see the excellent guidance provided by Employee Tax Expert KathrynG3 here for accomplishing what it appears you want to do. She has two posts in the link that should be helpful.
Under recent tax law, while hobby income must still be included in your gross income, hobby operating expenses aren't deductible. But your cost of goods sold can still offset hobby income directly.
See the Employee expenses and other miscellaneous deductions subject to the 2% limit dropdown in the TurboTax Help article Which federal tax deductions have been suspended by tax reform? for more information.
