Cyber attacks are happening worldwide on a daily basis. It results in a great need to have a system that can construct a practical network environment, in terms of both network functions and background traffic flows, for the purposes of security tool assessment and cyber range creation. The concept of ``cloning'' traditionally is to create an identical copy of a single entity, such as a machine or a software. In this paper, we propose an extension of this concept through building a system that can clone a production environment, both in terms of network functions and legitimate traffic flows. We also present our current progress in building the first prototype of the system.