§1. It is for the bishop of the principal seat to approve the constitutions and confirm changes legitimately introduced into them, without prejudice to those things which the Apostolic See has taken in hand, and also to treat affairs of greater importance affecting the whole institute which exceed the power of internal authority, after he has consulted the other diocesan bishops, however, if the institute has spread to several dioceses.
§2. A diocesan bishop can grant dispensations from the constitutions in particular cases.
Source: Code of Canon Law (Vatican.va)