A planner may use simulation for in the analysis and design of construction operation processes to optimize overall performance of a construction system. Normally, the basic elements used in construction operation process simulation system such as CYCLONE (CYCLic Operation NEtworks) are activities and queues. Activity is used to model the execution of the task work which consumes resources and time to perform. Queue acts as a storage location for resources entering an idle state. In the simulation system, queues have to be created according to the ways of assigning resources to activities. Conventionally, planner creates queue at his/her judgment distinguishing what resources and how many should be allocated to which activity. This paper introduces a Genetic Algorithms (GA) based modeling mechanism for facilitating the automation of modeling resource distribution scenarios.