If one company controls another company and is itself not a subsidiary of another company, then it is called an ultimate holding company.
A company is a 'subsidiary' of another company, if (and only if) at least one of the following is the case:
the company is a subsidiary of a subsidiary of the other company by virtue of (any or all of) (a), (b) or (c) above or any of the provisions of Division 6 of the Corporations Act 2001.
This is the contact person/company for any issues with the application. This is also who eCompanies will invoice for the registration