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In this article we have shown that the atomic states can be engineered bytunning the coupling Rabi frequency for a system with $\mathcal{N}$-typeconfiguration. Electromagnetically induced transparency (EIT),Electromagnetically induced absorption (EIA) and Autler-Townes (AT) splittinghas been observed experimentally in a four level $\mathcal{N}$-type atomicvapor of $^{85}Rb$ atoms in the hyperfine levels of $D_2$ transition. It hasbeen shown that the response of the atomic medium can be tunned from highlytransparent to highly absorptive in our case. The evolution of the atomicstates from the dark state |D> to the non-coupled state |NC> has been studiedwith the partial dressed state approach which makes the backbone of themodification of the atomic response. In addition, transient solutions in thetime domain and steady state solution in the frequency domain has been studied.The population dynamics and the coherence contribution in each case has beenanalyzed by the time dependent solutions. The experimentally observed steadyline-shape profiles has been supported by the steady state solution ofoptical-Bloch equations considering the Maxwell Boltzmann velocitydistributions of the atoms. It has been observed that the crossover between theEIT and the AT splitting has been replaced by the interference contribution ofthe EIA in this $\mathcal{N}$-type system.

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Interplay between electromagnetically induced transparency(EIT),  absorption (EIA) and Autler-Townes (AT) splitting in N-type atomic system: An  experiment and theory