§1. A diocesan bishop must take care that all the affairs which belong to the administration of the whole diocese are duly coordinated and are ordered to attain more suitably the good of the portion of the people of God entrusted to him.
§2. It is for the diocesan bishop himself to coordinate the pastoral action of the vicars general or episcopal vicars. Where it is expedient, a moderator of the curia can be appointed who must be a priest and who, under the authority of the bishop, is to coordinate those things which pertain to the treatment of administrative affairs and to take care that the other members of the curia properly fulfill the office entrusted to them.
§3. Unless in the judgment of the bishop local circumstances suggest otherwise, the vicar general or if there are several, one of the vicars general, is to be appointed moderator of the curia.
§4. Where the bishop has judged it expedient, he can establish an episcopal council, consisting of the vicars general and episcopal vicars, to foster pastoral action more suitably.
Source: Code of Canon Law (Vatican.va)