Component-based development methods (CBDM) become largely adopted and used. They replace the traditional methods by the introduction, in their development lifecycle, of two processes: design for reuse and design by reuse. However, these two processes are not clearly established and are combined in the majority of the CBDM. This paper aims to propose an approach to extend a CBDM by the reuse processes, using the Symphony method as a reference. A special interest is given to the reuse of business component for which we propose a conceptual model based on the variability concept that we consider a key property in a reuse process.