Manufacturing Execution System (MES) plays an important role for a company’s daily production operations, especially for the unexpected events and demands presented in On-of-a-Kind Production (OKP). This work study presents a MES using the software provided by OCTAVIC in a OKP company that manufactures body components and assemblies for prototypes and small series. The program enables real-time collection and real-time scheduling. To ensure the program provides as precise a production schedule as possible, the production processes are parametrized, and their duration calculated using the Material Removal Rate (MRR) of the milling machines for each process. In addition, to provide the program with all the necessary information in a more convenient way for the company’s personnel, a tool using Visual Basic (Excel Macro), and MySQL is developed.