Hi TonyDobbo,
Thanks for your post.
If you're having issues editing an existing SMSF in your file, you can create a new one with the updated bank details and then make sure to add a word at the name of the fund to avoid confusion such as 'New' for you to be able to identify which fund to use and link to your employees card file. To do this, you can check the Help Article: Set up superannuation funds for more information.
Feel free to post again anytime if you require further assistance.
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Best regards,
Doreen