sule 66Notes (History of Amendments in Bare Text): 1. CGST Rule 66 introduced vide Notification 102017, effective 01072017.. 2. Amendments in sub-rule (2) from 28062019Rule 66.1: Application of the Civil Procedure Rules: Rule 66.2: Action on behalf of the Crown: Rule 66.3: Counterclaims, other additional claims, and set-off: Rule 66.4: