The Corporations (Repeals, Consequentials and Transitionals) Act 2001 is a supporting Commonwealth Act that sits alongside the move to the Corporations Act 2001 and the Australian Securities and Investments Commission Act 2001. Its long title says it is an Act to deal with matters consequential on the enactment of those Acts, and for related purposes.
In practical terms, it performs four main functions. First, it repeals older corporations and ASIC-related laws. Secondly, it amends the new ASIC and corporations legislation on commencement. Thirdly, it makes consequential amendments across a very large number of other Commonwealth Acts so that references and legal interactions line up with the new national regime. Fourthly, it contains transitional rules for legacy matters, especially matters tied to the ACT former law, the former co-operative scheme legislation, and continuing Commonwealth agency functions under State and Territory national scheme laws.
That means this is not usually the first Act a business owner reads when dealing with ordinary company compliance. It is more often used to solve historical continuity questions. If your issue is about what happened to an old right, liability, instrument, proceeding or winding up when the law changed in 2001, this Act may be central.