How do I look up the total amount sold of a certain product for each month on my invoices please?

I can guide you on how to run reports of certain products, Sarah.

You can access the Sales by Product Service Detail report to see the total amount sold of a product per month. Let me help you with the process:

1. Login to QuickBooks Online.
2. Go to Reports on the left menu and click Reports.
3. In the search bar, type Sales by Product Service Detail.
4. Under the Report period, click the drop-down arrow to select the date.
5. Click Run report.

To further customize your report, please refer to this article: Customise reports in QuickBooks Online.

Let us know if you have other questions. We'll get back to you as soon as we can.