Look for it in the inventory section. You said Schedule C, not Schedule F, so I assuming you are reporting this under self-employment.
- Type self-employment income in Search in the top right
- Select Jump to self-employment income
- Tap Review next to your business
- Look at your Expenses
- If you do not see Inventory, select Add expenses for this work
- Select Less common and type Inventory in the search box
- Put a check mark next to Inventory and select Start
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