Hello e-ashley-hotmail,
Welcome to Community! QuickBooks Online automatically sets up common sales tax codes, based on your company location. Understanding sales tax codes and which ones to use is essential in keeping with Government guidelines, and accurate sales tax filings.
For your reference, here's a list of common sales tax codes. When choosing a sales tax code, your first step is to make sure that what you're buying or selling is taxable, and which sales tax code to apply. I suggest reviewing the information provided on the CRA website, to help with your business needs.
If you still have questions regarding sales tax codes, I recommend speaking with an accounting professional. If you don't have an accountant, we can help you locate a ProAdvisor in your local area.
Feel free to reach out again, if you have any other questions. We would be happy to help!