The need for seamless communications in future wireless networks imposes the development of distributed management systems, in which we can distinguish between different business entities, the Service and Network Providers. Such a highly dynamic environment enables the Service Providers to associate with multiple Network Providers and choose the best ones, according to user satisfaction and network's reward criteria. In this direction, this paper presents a Service Management System from the SP's perspective ( SP-SMS). The SP-SMS can be separated into two planes, namely the service and network resource plane, and three layers, the Session Configuration Layer, the Local Planning Layer and the Global Planning Layer. Our study focuses on the Local Planning Layer and the role of the related components, which are introduced to describe the functionality of this layer. Through representative results, we demonstrate the superiority of the proposed model, in terms of utilisation and aggregate revenue.