To perform a successful optimization of large and complex production facility, there should be a good communication between engineers at different departments (Reservoir, Production, Geological, etc). However, as a common practice, their decision making process is separate from each other. This may result in under-designing such as flow bottlenecks or over designing, which imposes unnecessary expenditures. This lack of communication can be alleviated by coupling the reservoir flow model to the facility network by means of enhancements in software development that can perform networking analysis in an effective manner. This paper presents a work methodology and recommendations through a case study to develop an offshore field that contains both heavy and medium oil. First, commercial software is utilized to build the model according to the input data. Subsequently, a development plan has been suggested for this field and number of wells to be drilled in the reservoir has been determined. Then sensitivity analysis is performed to find out the best possible scenario to produce from the field. Economical analysis is performed for each case to assure profitability.According to the available recoverable reserves, a 13 year production plan is proposed (average of 7.46% per year). Simulation results indicate that by the proposed scenario at least 20% more of total recoverable reserves can be produced over this period. The highest oil rate is observed at the end of fourth year (98000 STB/d), when the field is mainly developed. This case study shows that complex production systems can be modeled by commercial software, which leads into better production forecasts. In addition, it can help us in selecting proper down-hole equipments and predicting the possible problems in each well (such as sand production or asphaltene deposition in this case).