Review the code to copy List of custom class to another list of Custom class
One thing I guess you can consider is to add a constructor for class FlowCopy that handles (or encapsulates) the copy task to release this burden from function getFlow():

public class FlowCopy {
    public FlowCopy(FlowObject obj) {
        setId(obj.getId());  
        setAudioRefs(obj.getAudRefs());  
        setCallSteps(obj.getFlowSteps());
    }
   ...
}