Hi Jess, I looked high and low through the My Account portal trying to find an option to add an ABN. I found a great page telling us the benefits of adding an ABN but know information on how to do it. I have a suspicion that you have to be signing up for a business account to do this however I could be wrong about that. Might pay to jump onto the live chat (second link) below and ask support the question. I would be interested in knowing the answer myself if you manage to find out. 
https://yescrowd.optus.com.au/t5/Blog/Why-you-should-add-your-ABN-to-your-Optus-account/ba-p/194578
@jess310 - We should be able to add an ABN to your account if we can verify all the details. Would you be able to send through your account details, full name and DOB?
Hey @oz1siiam,
Thanks for reaching out to us about this.
To confirm was this the form you needed? This one is for Small to Medium business customers.
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Hey @oz1siiam, I've replied back to your other thread and sent you a PM. We'll chat there 🙂
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Hi, please chat with a Business Specialist.
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