The speed of transformation of today's industrial world increasingly requires the development of simple and flexible tools capable of effectively supporting the decision-making process. In fact, corporate leaders interface daily with the need to quickly choose optimal configurations for their processes. In this sense, it is necessary to create a tool capable of supporting the "what if" analysis on the configuration of a production system and allowing to quantitatively estimate the effects of the variations on the most significant parameters. This paper proposes a set of criteria for expanding the Value Stream Map – a well-known tool in the Lean context – and defining the data categories required in input and output for sub-process modeling, in order to increase the level of detail and make it an interesting candidate to support the development phases of a simulation project. The proposal was validated on a production process of large manufacturing multinational company.