It is subordinate to the Bible as the supreme standard, which is held as divinely inspired and without error.
The Westminster Confession of Faith was modified and adopted by Congregationalists in England in the form of the Savoy Declaration (1658).
The Three Forms of Unity (the Belgic Confession, Heidelberg Catechism and the Canons of Dort) were adopted as subordinate standards in the Dutch Reformed Church, a practice which was embraced by most Dutch Reformed denominations and federations around the world.
For example, in 1789 the Presbyterian Church in the United States of America adopted the Westminster Confession of Faith, together with the Larger Catechism and the Shorter Catechism, but modified the Confession to bring its teaching on civil government in line with American practices and removed references to the Pope as an Antichrist.
The Presbyterian Church of Victoria, one of its constituent bodies, also subscribes to the "general principles" of the Larger and Shorter Catechisms, the Form of Presbyterial Church Government, the Directory of Public Worship, and the 1578 Second Book of Discipline.