You will have to create a new Pay Category for Paid Parental Leave, then apply the pay category to the employee.
Here is an article for more information on how to set up the pay category and how it applies to your pay runs: https://support.yourpayroll.com.au/hc/en-au/articles/207729673-Parental-Leave
At this point, we don't have an article outlining the steps to record the Paid Parental Leave subsidy. I can see how that would be useful and would be happy to pass this request on to see if this is something that can be organised. However, as this will impact your books I would encourage you to speak with your accountant/tax practitioner or a QuickBooks Certified ProAdvisor as they may have a preferred process on entering these kind of subsidies and we are unable to provide advice on accounting.