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A CAD/CAM system has become a dominant system in modern production techniques. In the attempts to facilitate the transfer of design data and geometry between the huge varieties of the International working CAD/CAM systems, the International Standard for the Exchange of Product coding system (STEP) is introduced (ISO Step AP-203). Extraction of the entities is the first step in the automated programming either for process planning, product classification or in programming for Numerical Control Machine Tools. This step is the aim of this paper in a line of several steps to build a complete CAD/CAM system for manufacturing of complicated products. A methodology is developed to extract each entity. Software has been built using Visual Studio C# - Version 2010. Interface is designed giving all the entities and showing the geometrical shape of the product. Different cases have been tested to verify the developed software and full successfulresults were obtained.