Hi Vk2,
Thanks for reaching out and welcome to the Community Forum.
Thank you gavin12345 for the insight. As mentioned, MYOB would not let you report a pay event from a financial year when STP is not set up yet. Our options to proceed would be to either manually lodge the payment summaries or any of gavin12345's suggested methods. For more information here is the link https://www.ato.gov.au/Forms/PAYG-payment-summaries--forms-and-guidelines/.
Let us know if you require any further assistance with this. We're happy to help.
Cheers,
Genreve