In everyday life we do not realize what a difficult process and how all the components needed to perform perfectly normal activity at the car door opening. Every business, whether engaged in the production of products or the provision of services, aims to make everything work as efficiently as possible and to achieve the maximum with the least amount of money. The paper deals with production and assembly line in selected production process. It is a manufacturing process for manufacturing car handles and their components. The manufacturing process consists of several assembly stations, which in turn ensure the product of the finished product. We analysed the process and transformed it into simulation models in Tecnomatix Plant Simulation. In addition to the software module, we used the Hoshin method, which is commonly used in industrial enterprises, to increase efficiency. This method is used in businesses that seek to develop an annual strategy to be applied at all levels of the enterprise.