Lion, 官网是这么回答的:
Can I change my ANZSCO nomination once my application is in process?
Please email your reference number and enquiry details to - [email protected].
Your case officer will endeavor to make the change for you, depending on the stage of your application.
Once your application is at stage 4 of the assessment process as shown on the Application Status webpage, it is highly unlikely that you will be able to change your ANZSCO code as your application will already be in the process of assessment.