This command is typically used during the model-building process to select events from a data file that match the model. Before using the command, you should make sure that the only parameters with Match Status enabled are those that use "Constant" profiles. Constant profiles are sometimes referred to as "selection" profiles, because they are used to select subsets of events from the data file. They are the most useful for the Enrich Data because they are so simple and robust.
The Auto Analyze command uses this command as part of its analysis process.