ABSTRACT: Volume 3 of the CABS BOS is the fourth of a six volume set. It contains the Billing Data Tape (BDT) records, the mechanized equivalent of the bill and CSR print images. Each record is displayed with all pertinent data, including element name, record positions, field length and characteristics. A narrative text, along with guides for certain records are also included. Note that the data elements appearing on the BDT are defined within SR-1874 (CABS BOS Volume 4). This issue contains all revisions for the BDT up to and including Version 59, which becomes effective September 2019. The updates for Issue 29 include removal of Section 4.39 and adding an Appendix for the change control history of the document. The Appendix is a work-in-progress with the end goal to provide the history of changes from 2000 - present. CABS modifications presented in revisions of this document are summarized to provide a cumulative history of changes. The Appendix identifies the specific additions, deletions and changes made to the supporting text for CABS elements since January 2000.