Hello there, Becky93.
QuickBooks Self-Employed (QBSE) doesn't have a specific category cost of goods sold or inventory. QBSE only tracks business expenses and income for estimated tax calculations.
In your case, you can use an expense account for the products that you bought to use on services.
Also, since you're new to QBSE, I'd like to share the following resources to learn more about the product:https://community.intuit.com/quickbooks-self-employed.
You can keep up-to-date with product updates and feature releases by viewing the QuickBooks Blog: https://quickbooks.intuit.com/blog/.
Should you have other concerns aside from this, feel free to reach back to me. I'd be happy to assist.