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While migrating existing software systems to Software Product Lines, finding out the functionalities in the software is critical. For maintenance activities like deleting or changing existing features, or adding new similar features, identifying and extracting functionalities from the software is significant. This paper describes a technique for creating mapping between the source code and functionalities implemented by it while exploiting the domain knowledge. The technique is based on the notion of function variables that are used by developers for expressing functionality in the source code. By tracking the known values of the function variables and evaluating the conditions that use them, the mapping is identified. Our technique makes use of static data ow analysis and partial evaluation, and is designed with automation perspective. After applying to few samples representing real-life code structure and programming practices, the technique identified precise mapping of the detailed program elements to functions