To generate an Invoiced Items/Services report that shows any invoice with a specific item or service on it for a specific time frame, click the "Reports" tab.
Then under the "Financial" section, click "Invoiced Items and Services".
Choose the date range, category, and/or items/services you want on the report from the dropdowns at the top of the page.
(Note: by default, it shows the current year to date).
Once your report has been generated, you can then export an Excel file, CSV file, or print the report.