I have a client currently using online payroll as part of their subscription... they now want to start paying employees fortnightly and want to upgrade to Advanced how?

I appreciate your time reaching out to us here, carl22.

For upgrading your payroll subscription to Advanced, you will need to reach out to our Payroll Support Team. They have the necessary tools to assist you with the process. 

Before doing so, please check out the product comparison here: Product feature comparison for Payroll. Then, follow these steps to contact support: 

1. Click the Help icon located in the upper right-hand corner.
2. In the Help window, click the Contact Us button located at the bottom.
3. Enter your question and click Let's talk.
4. Choose either Start a chat or Call us.

If you have the new QuickBooks Assistant help update, you can follow these steps:

1. In your QuickBooks Online account, go to the Help > Assistant.
2. Type Talk to a human and proceed with I still need a human.
3. Click the Contact us link.
4. Select either Messaging or Callback.

You can also read this article to learn more about the Advanced payroll: QuickBooks Online Advanced Payroll hub.

Should you have other questions or concerns about QuickBooks, please let me know in the comments below. I'll be around to help you out some more. Take care!