The Enterprise Knowledge Development - Change Management Method (EKD-CMM) provides a systematic way to organise and to guide the organisational change management. The EKD-CMM road map, implemented in the electronic guide book , describes the different routes to manage change through modelling using EKD-CMM. Roughly speaking a route is a sequence of steps to be followed by the EKD-CMM user. Every step in one possible EKD-CMM route is supported by guidelines. This paper presents the guideline allowing an enterprise to construct its change process model when its current goals, its external constraints, its future requirements and its existing processes are known. The undertaken modelling approach, called "goal deployment" approach, proposes an iterative process which consists in progressively generating the hierarchy of change goals by studying the impact of the external constraints onto the current goals and of defining the impacts of the change on current business processes. The approach is illustrated using examples borrowed to an industrial case of the electricity supply sector where change management is motivated by European deregulation rules.