Can I change a pay period from fortnightly to manual given I have employees on an as needs basis and the personnel change often?

Hi Williamson-Ursul, 

Thank you for reaching out on this. 

In this case, you can create an "Ad-hoc" pay run for your employees. Here is how:

• How do I process an 'Ad hoc' Pay Run 
  • https://support.yourpayroll.com.au/hc/en-au/articles/200077615-How-do-I-process-an-Ad-hoc-Pay-Run

Please let us know if you have any question when following this instruction. Thank you.