§1. Having observed the prescripts issued by the Apostolic See, it is for the diocesan bishop to issue norms for catechetics, to make provision that suitable instruments of catechesis are available, even by preparing a catechism if it seems opportune, and to foster and coordinate catechetical endeavors. §2: If it seems useful, it is for the conference of bishops to take care that catechisms are issued for its territory, with the previous confirmation of the Apostolic See.
§3. The conference of bishops can establish a catechetical office whose primary function is to assist individual dioceses in catechetical matters.
Source: Code of Canon Law (Vatican.va)