Hi mrskatecorby
I'm sorry to see that no one has replied to you yet. Payments are reported to the ATO through STP according to the ATO reporting category assigned to the pay item. If you're not sure about which ATO reporting category to assign to those super contributions you would need to speak to your accountant or the ATO.
The Help Article, Additional super contributions, has detailed information on setting up and paying those amounts.
Please don't hesitate to post again if you need help in the future.
If my response has answered your enquiry please click "Accept as Solution" to assist other users find this information.
