This paper will help understand the benefits of a multi-level, multi-physical, customizable and deployable system simulation platform for steady-state and transient analysis of Vehicle Energy Management Simulators. The underlying technical principles of the simulation software, LMS Imagine.Lab AMESim, will be described. The methodology and the different steps to build the complete Vehicle Energy Management simulator will be explained, and more particularly the complete process for the completion of the simulator: components characterization, design of involved subsystems, modeling of the interaction between the subsystems so as to end-up with the complete simulator.