This is what my migration agent sent.
hope you are well. After careful review of your situation your agent has advised the below,
Nominator changes their ABN or ACN
Nominators can sometimes change ownership or business structures during the processing of a nomination or visa application which results in a new ABN or ACN. Nominators who obtain a new ABN or ACN are considered to be separate new entities, even if there are no practical differences, for example, the management and business practices remain unaffected.
Where the ABN or ACN details specified on the nomination form change, a new nomination must be lodged and the business will need to be reassessed against Regulation 5.19(2)(a).
Any associated visa application should be withdrawn and the nominee will need to make a new visa application. This is because the associated nomination will no longer be able to satisfy the visa time of decision criteria 856.221, that an approved nomination continues to satisfy all criteria for approval. A new visa application will be required as a new nomination must be lodged.
I called the immigration this morning and explained the situation they said that i just need to fill up 1022 form and send it to nsw.pse@homeaffairs.gov.au
They said there is no legislation about changing nba or ownership