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//Note: you may need to check for the screen (or put the conditions we run over with)
if(argv["screen"] == "create-subtask") { //only on that screen
  string[] issueTypes = {"New Feature", "Improvement"}; //the array of the Issue Types 
  string[] subTasks = {"Sub-task"}; //the array of the Sub-Tasks to restrict
  if(elementExists(issueTypes, issueType)) {
      lfRestrictSelectOptions("issueType", subTasks);
  }
}