Hi MrsSwaino,
Thank you for reaching out about the processing of super-back payments.
In addressing back payments of super spanning six years, particularly when they haven't been calculated within a specific payroll category, considering you're directly remitting the super and additional fees to the ATO via BPAY, it's not essential to process these payments through the Pay Super feature screen. Instead, you have the option to manually record super payments via Pay Liabilities. For further guidance on this process, please refer to the Help article: Paying payroll liabilities.
Feel free to post anytime you need further assistance.
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Cheers,
Princess