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MARTY is a C++ computer algebra system specialized for High Energy Physicsthat can calculate amplitudes, squared amplitudes and Wilson coefficients in alarge variety of beyond the Standard Model scenarios up to the one-loop order.It is fully independent of any other framework and its main developmentguideline is generality, in order to be adapted easily to any type of model.The calculations are fully automated from the Lagrangian up to the generationof the C++ code evaluating the theoretical results (numerically, depending onthe model parameters). Once a phenomenological tool chain has been set up -from a Lagrangian to observable analysis - it can be used in a modelindependent way leaving only model building, with MARTY, as the task to beperformed by physicists. Here we present the main steps to build a general newphysics model, namely gauge group, particle content, representations,replacements, rotations and symmetry breaking, using the example of a 2 HiggsDoublet Model. The sample codes that are shown for this example can be easilygeneralized to any Beyond the Standard Model scenario written with MARTY.

Semi-automated BSM model building procedures in MARTY-1.1 through a 2HDM example