diff --git a/js/libs/jquery.simpler-select.js b/js/libs/jquery.simpler-select.js
index c5fbb23..9fe56c6 100755
--- a/js/libs/jquery.simpler-select.js
+++ b/js/libs/jquery.simpler-select.js
@@ -52,9 +52,9 @@
       var $currentSelect = $selectElement;
 
       if (initialValue) {
-        if (typeof initialValue !== 'string') {
-          // If array, flatten it.
-          initialValue = initialValue.shift();
+        if (initialValue instanceof Array) {
+          // If array, get the last / deepest value.
+          initialValue = initialValue.pop();
         }
 
         // Get all parents, starting from the initial value.
@@ -152,6 +152,13 @@
           parentValue = selectedValue;
         }
 
+        if (undefined !== that.$element.attr('multiple')) {
+          that.$element.val(undefined);
+          var parents = that.getAllParents(parentValue);
+          parents.push(parentValue);
+          parentValue = parents;
+        }
+
         that.$element
           .val(parentValue)
           .change();
diff --git a/src/CshsOptionsFromHelper.php b/src/CshsOptionsFromHelper.php
index 1d38259..b3e7031 100644
--- a/src/CshsOptionsFromHelper.php
+++ b/src/CshsOptionsFromHelper.php
@@ -24,6 +24,7 @@ trait CshsOptionsFromHelper {
       'parent' => 0,
       'level_labels' => '',
       'force_deepest' => FALSE,
+      'save_lineage' => FALSE,
     ];
   }
 
@@ -68,6 +69,10 @@ trait CshsOptionsFromHelper {
       '@force_deepest' => empty($settings['force_deepest']) ? $this->t('No') : $this->t('Yes'),
     ]);
 
+    $summary[] = $this->t('Save lineage: @save_lineage', [
+      '@save_lineage' => empty($settings['save_lineage']) ? $this->t('No') : $this->t('Yes'),
+    ]);
+
     $summary[] = $this->t('Parent: @parent', [
       '@parent' => empty($settings['parent']) ? $this->t('None') : $this->getTranslationFromContext($this->getTermStorage()->load($settings['parent']))->label(),
     ]);
@@ -91,6 +96,9 @@ trait CshsOptionsFromHelper {
    *   The form definition for the settings.
    */
   public function settingsForm(array $form, FormStateInterface $form_state) {
+    /* @var \Drupal\Core\Field\FieldStorageDefinitionInterface */
+    $field_storage = $this->fieldDefinition->getFieldStorageDefinition();
+
     $vocabulary = $this->getVocabulary();
     $options = [];
 
@@ -106,6 +114,14 @@ trait CshsOptionsFromHelper {
       '#default_value' => $this->getSetting('force_deepest'),
     ];
 
+    $element['save_lineage'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Save lineage'),
+      '#description' => $this->t('Save all parents of selected terms. The field must allow an unlimited number of items.'),
+      '#default_value' => $field_storage->getCardinality() < 0 && $this->getSetting('save_lineage'),
+      '#disabled' => $field_storage->getCardinality() > 0,
+    ];
+
     $element['parent'] = [
       '#type' => 'select',
       '#title' => $this->t('Parent'),
@@ -144,6 +160,7 @@ trait CshsOptionsFromHelper {
       '#vocabulary' => $vocabulary,
       '#none_value' => CSHS_DEFAULT_NONE_VALUE,
       '#force_deepest' => $settings['force_deepest'],
+      '#multiple' => $settings['save_lineage'],
       '#default_value' => CSHS_DEFAULT_NONE_VALUE,
     ];
   }
diff --git a/src/Element/CshsElement.php b/src/Element/CshsElement.php
index f1f3e80..3137acb 100644
--- a/src/Element/CshsElement.php
+++ b/src/Element/CshsElement.php
@@ -79,7 +79,13 @@ class CshsElement extends Select {
     elseif ($element['#force_deepest']) {
       /* @var \Drupal\taxonomy\TermStorage $storage */
       $storage = \Drupal::entityTypeManager()->getStorage('taxonomy_term');
-      $term = $storage->load($element['#value']);
+
+      $value = $element['#value'];
+      if (is_array($value)) {
+        $value = end($value);
+      }
+
+      $term = $storage->load($value);
 
       // Set an error if term has children.
       if (!empty($storage->loadChildren($term->id(), $term->getVocabularyId()))) {
diff --git a/src/Plugin/Field/FieldWidget/CshsWidget.php b/src/Plugin/Field/FieldWidget/CshsWidget.php
index 71e1f1b..4986523 100644
--- a/src/Plugin/Field/FieldWidget/CshsWidget.php
+++ b/src/Plugin/Field/FieldWidget/CshsWidget.php
@@ -56,12 +56,42 @@ class CshsWidget extends WidgetBase {
   public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
     $element['target_id'] = array_merge($element, $this->helperFormElement(), [
       '#label' => $this->fieldDefinition->getLabel(),
-      '#default_value' => $items->get($delta)->getValue(),
     ]);
 
+    if ($items->isEmpty()) {
+      return $element;
+    }
+
+    if ($this->handlesMultipleValues()) {
+      $element['target_id']['#default_value'] = array_map(function($item) {
+        return $item['target_id'];
+      }, $items->getValue());
+    }
+    else {
+      $element['target_id']['#default_value'] = $items->get($delta)->getValue();
+    }
+
     return $element;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function massageFormValues(array $values, array $form, FormStateInterface $form_state) {
+    if (!$this->handlesMultipleValues()) {
+      return parent::massageFormValues($values, $form, $form_state);
+    }
+
+    $id_values = $values['target_id'];
+    $values = [];
+
+    foreach ($id_values as $id) {
+      $values[]['target_id'] = $id;
+    }
+
+    return $values;
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -75,4 +105,11 @@ class CshsWidget extends WidgetBase {
     return $this->getVocabularyStorage()->load(reset($settings['handler_settings']['target_bundles']));
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  protected function handlesMultipleValues() {
+    return $this->getSetting('save_lineage');
+  }
+
 }