How to Group or Indent Table Categories Within NETs

includeWeb("JavaScript Array Functions");
form.setHeading("Group rows according to NETs");
form.setSummary("Group rows according to NETs");

var blue_question = table.blueQuestion;
var data_reduction = blue_question.dataReduction;
var use_codes;
if (["Nominal", "Binary - Multi (Compact)"].indexOf(blue_question.variableSetStructure) > -1)
  use_codes = true;
else if (["Binary - Multi"].indexOf(blue_question.variableSetStructure) > -1)
  use_codes = false;
else
  form.ruleNotApplicable("the question selected in the Rows drop-down is not Binary - Multi, Nominal, or Binary Multi - Compact");
if (arrayHasDuplicateElements(table.rowLabels))
  form.ruleNotApplicable("there are duplicate row labels in the table")
var indent_label = " - ";
// Row weights are used to keep children in the correct order.
var row_weights = {};
// Find underlying row sources
var row_values = table.rowLabels
  .filter(function (label) {
  return label !== 'NET';
})
.map(function (label, i) {
  row_weights[label] = i;
  return {
  label: label,
  sources: use_codes
  ? data_reduction.getUnderlyingValues(label)
  : data_reduction.getUnderlyingVariables(label).map(function (v) {
  return v.name;
})
}
});
// Create a map of the rows that are sourced from a single variable
var individual_values_map = {};
row_values
  .filter(function (value) {
  return value.sources.length === 1;
})
  .forEach(function (value) {
  individual_values_map[value.sources[0]] = {label: value.label, source: value.sources[0]}
});
// Populate the rows with multiple sources with their visible individual row data
var net_values = row_values
  .filter(function (value) {
  return value.sources.length > 1;
})
  .map(function (value) {
  var new_value = {
  label: value.label,
  sources: value.sources,
  children: value.sources
  .map(function (source) {
   return individual_values_map[source];
})
 .filter(function (source) {
   return typeof source !== 'undefined'
})
};
new_value.children.sort(function (a, b) {
 return row_weights[b.label] - row_weights[a.label];
});
 return new_value;
});
// Create an array to store the labels that have been updated.
var changed_row_labels_map = {};
for (var i = 0; i < net_values.length; i++) {
  var value = net_values[i];
  value.children.forEach(function (child) {
    table.moveRowAfter(table.rowIndex(child.label), table.rowIndex(value.label));
    changed_row_labels_map[child.label] = indent_label + child.label;
});
}
table.rowLabels = table.rowLabels.map(function (label) {
  return typeof changed_row_labels_map[label] !== 'undefined' ? changed_row_labels_map[label] : label;
});