In the simulation model, it is assumed that the three different means of container transportation arrive to the system already loaded with no regard to where or how these containers came from. In order to do that, a ship, train or truck is initially created as one entity until it reaches the port. At that instant, it is duplicated to produce the amount of containers that it should carry and these new duplicates are assigned a new entity type to make the model recognize them as containers. The Separate Module in Arena was used to perform the duplication.