Hi SusanMMatthews,
Thank you for your post, however, sorry to see no one has responded to your query.
You may have already received/found an answer for this elsewhere, but I will provide a response to your query for the benefit of other users that may be in a similar situation.
The system will allow you to make this additional payment regardless of the payment cycle you are on (quarterly), but you do need to keep your 'Pay Super limit' in mind as this could be exceeded if it is an irregular payment that may not have been accounted for.
Do reach out if you have any further queries.
If my response has answered your enquiry please click "Accept as Solution" to assist other users find this information.