How does the Presbyterian Church (U.S.A.) constitution divide doctrine from church government?

The Presbyterian Church (U.S.A.) divides its constitution into two distinct volumes to separate matters of faith from administrative structure:1

• The Book of Confessions: This volume is dedicated to matters of doctrine. It contains a compilation of creeds and confessions that define the church's theological identity, including historic documents like the Nicene Creed, the Westminster Confession, and the Confession of 1967.21
• The Book of Order: This volume is concerned with matters of church government, organization, and membership. It outlines the structure of the church's governing bodies—ranging from the local session to the regional presbytery and synod, up to the General Assembly—and establishes the rules for how the denomination functions.1

By maintaining these two separate volumes, the church distinguishes its foundational theological commitments from the practical, administrative frameworks used to govern the denomination.1