Abstract: A process of merging an original drawing file and at least one updated or modified drawing file based on the original drawing file to produce a common or merged drawing file. The original drawing file and the updated drawing file are first stored in a storage medium and then merged. The entities of the original and updated drawings are then compared for duplicate entities and modified entities. Entities of the original drawing that are duplicated in the updated drawing are automatically removed. Entities of the original drawing that have been modified in the updated drawing are also automatically removed.