Hi CCR_2000,
Thank you for your post.
Regarding your concern, yes, you could run two separate files in one ABN, however, when it is time to report to the ATO you would need to combine the two as it is all one ABN. If you run two separate accounts, you will also need two separate bank accounts.
I hope this helps. If you need further assistance or if you have other questions and concerns, please do not hesitate to contact us again. We are happy to help.
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Kind Regards,
Cel