diff --git a/helfi_tpr.install b/helfi_tpr.install
index 26c68de..96318ab 100644
--- a/helfi_tpr.install
+++ b/helfi_tpr.install
@@ -300,22 +300,3 @@ function helfi_tpr_update_8045() : void {
   \Drupal::entityDefinitionUpdateManager()
     ->installFieldStorageDefinition('topical', 'tpr_unit', 'helfi_tpr', $topical_field);
 }
-
-/**
- * UHF-9159 Add SUBGROUP field to Unit entity.
- */
-function helfi_tpr_update_8046() : void {
-  $subgroup_field = BaseFieldDefinition::create('tpr_connection')
-    ->setLabel(new TranslatableMarkup('Subgroup', [], ['context' => 'TPR Unit field label']))
-    ->setDescription(new TranslatableMarkup('The "SUBGROUP" connection type'))
-    ->setTranslatable(TRUE)
-    ->setCardinality(BaseFieldDefinition::CARDINALITY_UNLIMITED)
-    ->setDisplayOptions('form', [
-      'type' => 'readonly_field_widget',
-    ])
-    ->setDisplayConfigurable('form', TRUE)
-    ->setDisplayConfigurable('view', TRUE);
-
-  \Drupal::entityDefinitionUpdateManager()
-    ->installFieldStorageDefinition('subgroup', 'tpr_unit', 'helfi_tpr', $subgroup_field);
-}
diff --git a/migrations/tpr_unit.yml b/migrations/tpr_unit.yml
index 79a7fc0..89ea5e1 100644
--- a/migrations/tpr_unit.yml
+++ b/migrations/tpr_unit.yml
@@ -104,18 +104,6 @@ process:
       value: value
       data: data
       type: type
-  _subgroup_connections:
-      plugin: array_element_equals
-      source: connections
-      value: SUBGROUP
-      key: type
-  subgroup:
-    plugin: sub_process
-    source: '@_subgroup_connections'
-    process:
-      value: value
-      data: data
-      type: type
   _contacts_connections:
       plugin: array_element_equals
       source: connections
diff --git a/src/Entity/Unit.php b/src/Entity/Unit.php
index d7f5255..4489230 100644
--- a/src/Entity/Unit.php
+++ b/src/Entity/Unit.php
@@ -356,10 +356,6 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) :
         'description' => 'TOPICAL',
         'label' => new TranslatableMarkup('Topical', [], ['context' => 'TPR Unit field label']),
       ],
-      'subgroup' => [
-        'description' => 'SUBGROUP',
-        'label' => new TranslatableMarkup('Subgroup', [], ['context' => 'TPR Unit field label']),
-      ],
     ];
 
     foreach ($connectionFields as $name => $data) {
diff --git a/src/Field/Connection/Repository.php b/src/Field/Connection/Repository.php
index 2ad81f4..dd238eb 100644
--- a/src/Field/Connection/Repository.php
+++ b/src/Field/Connection/Repository.php
@@ -23,7 +23,6 @@ final class Repository {
     Link::TYPE_NAME => Link::class,
     PhoneOrEmail::TYPE_NAME => PhoneOrEmail::class,
     Topical::TYPE_NAME => Topical::class,
-    Subgroup::TYPE_NAME => Subgroup::class,
   ];
 
   /**
diff --git a/src/Field/Connection/Subgroup.php b/src/Field/Connection/Subgroup.php
deleted file mode 100644
index fed229e..0000000
--- a/src/Field/Connection/Subgroup.php
+++ /dev/null
@@ -1,67 +0,0 @@
-<?php
-
-declare(strict_types = 1);
-
-namespace Drupal\helfi_tpr\Field\Connection;
-
-use Drupal\Component\Utility\Html;
-
-/**
- * Provides a domain object for TPR connection type of Subgroup.
- */
-final class Subgroup extends Connection {
-
-  /**
-   * The type name.
-   *
-   * @var string
-   */
-  public const TYPE_NAME = 'SUBGROUP';
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getFields(): array {
-    return [
-      'name',
-      'contact_person',
-      'phone',
-      'email',
-    ];
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function build(): array {
-    $fields = $this->getFields();
-    $fields_data = [];
-    $name = '';
-
-    foreach ($fields as $field) {
-      if (!$this->get($field)) {
-        continue;
-      }
-
-      $data = Html::escape($this->get($field));
-
-      if ($field === 'name') {
-        $fields_data[] = '<strong>' . $data . '</strong>';
-      }
-      else {
-        $fields_data[] = $data;
-      }
-    }
-
-    $markup = '<p>' . implode('<br>', $fields_data) . '</p>';
-
-    $build = [
-      'contact' => [
-        '#markup' => $markup,
-      ],
-    ];
-
-    return $build;
-  }
-
-}