diff --git a/modules/opencase_cases/opencase_cases.module b/modules/opencase_cases/opencase_cases.module
index e131cd6..99cf06d 100644
--- a/modules/opencase_cases/opencase_cases.module
+++ b/modules/opencase_cases/opencase_cases.module
@@ -96,36 +96,19 @@ function opencase_cases_get_activities(Drupal\opencase_cases\entity\OCCase $case
   return $activities;
 }
 
-function opencase_cases_get_amount(Drupal\opencase_cases\entity\OCCaseFee $case_fee): string {
-  if (!isEmpty($case_fee->amount)) return $case_fee->amount->first()->value;
-  else return '0';
-}
-
-function opencase_cases_get_case(Drupal\opencase_cases\entity\OCCaseFee $case_fee): Drupal\opencase_cases\entity\OCCase {
-  return $case_fee->oc_case->referencedEntities()[0];
-}
-
-function opencase_cases_update_total_fee_for_case_belonging_to_case_fee(Drupal\opencase_cases\entity\OCCaseFee $case_fee): void {
-  $total = 0;
-  $case = opencase_cases_get_case($case_fee);
-  $case_fees = opencase_cases_get_case_fees($case);
-  foreach($case_fees as $case_fee) {
-    $total += opencase_cases_get_amount($case_fee);
-  }
-  $case->set('total_fee', $total);  
-  $case->save();
-}
-
 function opencase_cases_oc_case_fee_update(Drupal\opencase_cases\entity\OCCaseFee $case_fee): void {
-  opencase_cases_update_total_fee_for_case_belonging_to_case_fee($case_fee);
+  $case = $case_fee->getCase();
+  $case->addToTotalFee($case_fee->amount->value - $case_fee->original->amount->value);
 }
 
 function opencase_cases_oc_case_fee_insert(Drupal\opencase_cases\entity\OCCaseFee $case_fee): void {
-  opencase_cases_update_total_fee_for_case_belonging_to_case_fee($case_fee);
+  $case = $case_fee->getCase();
+  $case->addToTotalFee($case_fee->amount->value);
 }
 
 function opencase_cases_oc_case_fee_delete(Drupal\opencase_cases\entity\OCCaseFee $case_fee): void {
-  opencase_cases_update_total_fee_for_case_belonging_to_case_fee($case_fee);
+  $case = $case_fee->getCase();
+  $case->addToTotalFee(0 - $case_fee->amount->value);
 }
 
 function opencase_cases_entity_base_field_info($entity_type) {
diff --git a/modules/opencase_cases/src/Entity/OCCase.php b/modules/opencase_cases/src/Entity/OCCase.php
index c0838ec..12e679a 100644
--- a/modules/opencase_cases/src/Entity/OCCase.php
+++ b/modules/opencase_cases/src/Entity/OCCase.php
@@ -222,6 +222,10 @@ class OCCase extends RevisionableContentEntityBase implements OCCaseInterface
     return $this;
   }
 
+  public function addToTotalFee(float $amountToAdd): void {
+    $this->set('total_fee', $this->total_fee->value + $amountToAdd);
+    $this->save();
+  }
 
   /**
    * {@inheritdoc}
diff --git a/modules/opencase_cases/src/Entity/OCCaseFee.php b/modules/opencase_cases/src/Entity/OCCaseFee.php
index bb409cd..a73ff13 100644
--- a/modules/opencase_cases/src/Entity/OCCaseFee.php
+++ b/modules/opencase_cases/src/Entity/OCCaseFee.php
@@ -190,6 +190,10 @@ class OCCaseFee extends EditorialContentEntityBase implements OCCaseFeeInterface
     return $this;
   }
 
+  public function getCase():\Drupal\opencase_cases\Entity\OCCase {
+    return \Drupal\opencase_cases\Entity\OCCase::load($this->oc_case->target_id);
+  }
+
   /**
    * {@inheritdoc}
    */
diff --git a/opencase.links.menu.yml b/opencase.links.menu.yml
index 11eed02..f6d0444 100644
--- a/opencase.links.menu.yml
+++ b/opencase.links.menu.yml
@@ -50,6 +50,11 @@ opencase.opencase_admin_menu:
   route_name: opencase.opencase_admin_menu
   menu_name: opencase
   weight: 100
+opencase.manage_taxonomy_links:
+  class: Drupal\opencase\Plugin\Menu\ManageTaxonomyMenuLink
+  deriver: Drupal\opencase\Plugin\Derivative\ManageTaxonomyMenuLink
+  menu_name: opencase
+  parent: opencase.opencase_admin_menu
 opencase.manage_user_logins:
   title: 'Manage user logins'
   description: 'Manage who can access the system'
diff --git a/src/Plugin/Derivative/ManageTaxonomyMenuLink.php b/src/Plugin/Derivative/ManageTaxonomyMenuLink.php
new file mode 100644
index 0000000..76b59b8
--- /dev/null
+++ b/src/Plugin/Derivative/ManageTaxonomyMenuLink.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace Drupal\opencase\Plugin\Derivative;
+
+use Drupal\Component\Plugin\Derivative\DeriverBase;
+use Drupal\Core\Plugin\Discovery\ContainerDeriverInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+class ManageTaxonomyMenuLink extends DeriverBase implements ContainerDeriverInterface {
+
+  /**
+   * @var EntityTypeManagerInterface $entityTypeManager.
+   */
+
+  protected $entityTypeManager;
+  
+  /**
+   * Creates a AddEventsMenuLink instance.
+   *
+   * @param $base_plugin_id
+   * @param EntityTypeManagerInterface $entity_type_manager
+   */
+  public function __construct($base_plugin_id, EntityTypeManagerInterface $entity_type_manager) {
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+ /**
+   * {@inheritdoc}
+   */
+ public static function create(ContainerInterface $container, $base_plugin_id) {
+   return new static(
+    $base_plugin_id,
+    $container->get('entity_type.manager')
+   );
+ }
+  /**
+   * {@inheritdoc}
+   */
+  public function getDerivativeDefinitions($base_plugin_definition) {
+    $links = [];
+    $vocabs = $this->entityTypeManager->getStorage('taxonomy_vocabulary')->loadMultiple();
+    foreach ($vocabs as $id => $vocab) {
+      $links[$id] = [
+        'title' => 'Manage ' . $vocab->label(),
+        'route_name' => "entity.taxonomy_vocabulary.overview_form",
+        'route_parameters' => ['taxonomy_vocabulary' => $vocab->id()]
+      ] + $base_plugin_definition;
+    }
+    return $links;
+  }
+}
diff --git a/src/Plugin/Menu/ManageTaxonomyMenuLink.php b/src/Plugin/Menu/ManageTaxonomyMenuLink.php
new file mode 100644
index 0000000..0ce23fe
--- /dev/null
+++ b/src/Plugin/Menu/ManageTaxonomyMenuLink.php
@@ -0,0 +1,6 @@
+<?php
+namespace Drupal\opencase\Plugin\Menu;
+ 
+use Drupal\Core\Menu\MenuLinkDefault;
+ 
+class ManageTaxonomyMenuLink extends MenuLinkDefault {}