Feature Addition or Enhancement is a necessary fragment of product development. Feature Addition or Enhancement is a result of one of the following: scope addition to new product development or customer requirement on current products.When it comes to Scope Addition, most of the times, first phase design and engineering will have been completed. Feature Addition or Enhancement because of scope addition is done to improve quality, cost or marketability.Current or future customer request for a feature addition or enhancement to meet their needs leads to customer requirement Feature Addition or Enhancement. Most of the times, vehicle has already been launched and design is frozen.In both the cases, design and engineering is challenged by Time, Effort and Cost. Model Based Design approach helps save some time for implementation. It also helps to improve required effort and reduces the cost of the feature by optimization.This paper demonstrates the approach of Feature Addition or Enhancement by using Model Based Design.