I can give you some broad strokes generalizations for a CR brother in most CR orders, as we are a little different. A CR brother is a brother whose work supports the mission and community of the Order. Many CR orders are driven by ministry, as such a CR coajutor (modern technical term for a solemn professed brother in a clerical order) brother’s work must complement the work of the Order (like nurses or teachers) though ministerial activity or through auxiliary services within the communities (accountants or cooks, etc.). If one does not already have a profession then they are usually asked to pick a profession which is complementary to the Order to train in. There are three CR Orders which accept any profession as a coadjutor brother. These are the Theatines, Jesuits, and my own Clerics Regular Minor. Because they have such a varied ministry, any ministerial activity or profession is generally accepted.
The difference between Orders like Franciscans or Dominicans lies in the nature of the Order itself. The CR orders are purely clerical, meaning the fullness of their action in the world is found within the sacrament of Holy Orders. There is an element of the sacramental duties of a priest which is essential a member’s full participation as a CR. As such, a CR coadjutor will never be a local, provincial or general superior, nor will he usually be a novice master. The coadjutor’s purpose is to support the order and live out his life in the charism of the order.
In orders like the Franciscans or Dominicans, the state of a priest or a brother within the community is equal with regards to the hierarchy of the order. A brother may be made superior or novice master as the priesthood is not essential to the full execution of their role in the order. Because of this, however, Franciscan or Dominican solemn professed brothers are often transferred and reassigned as often as their priestly confreres. CR coadjutors can be transferred, but if they have a ministry or work outside of the community, then opportunities for transfer are usually limited.