Simulation modeling is one of the leading methods of computer modeling. It enables users to describe, understand and quantitatively analyse complex dynamic systems in different areas of industry and science. After the simulation model is developed, that model should be translated into a computer model, i.e. a simulation program. To create a simulation model, appropriate computer applications and associated tools are required. The computer application for the simulation of discrete events FlexSim was used in this work. The application has an object-oriented discrete-event simulation environment that can easily be used to develop a simulation model to visualize and monitor dynamic system process flow activities. The possibility of building a simulation is presented through two approaches, where the first is based on the standard 3D model, while the second is based on an additional FlexSim tool that is integrated within the application itself, such as Process Flow that is particularly useful during the simulation of complex operations. An advantage of the second concept was demonstrated by presenting a faster and more accurate construction process of the simulation model.