diff --git a/db/migrate/20231011150241_add_external_participants_from_cc_to_service_desk_settings.rb b/db/migrate/20231011150241_add_external_participants_from_cc_to_service_desk_settings.rb
new file mode 100644
index 0000000000000000000000000000000000000000..7e313657265c07bbf5d1e020394d7f9f06fa7d71
--- /dev/null
+++ b/db/migrate/20231011150241_add_external_participants_from_cc_to_service_desk_settings.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class AddExternalParticipantsFromCcToServiceDeskSettings < Gitlab::Database::Migration[2.1]
+  enable_lock_retries!
+
+  def change
+    add_column :service_desk_settings, :add_external_participants_from_cc, :boolean, null: false, default: false
+  end
+end
diff --git a/db/schema_migrations/20231011150241 b/db/schema_migrations/20231011150241
new file mode 100644
index 0000000000000000000000000000000000000000..f6fad411bf9a31eaa867172360ba59fcf9929a5a
--- /dev/null
+++ b/db/schema_migrations/20231011150241
@@ -0,0 +1 @@
+92e1c02f769e19e0a0eb6a5e23d2ae54cb02d4d1e1d6d2532dca736ae3d97cee
\ No newline at end of file
diff --git a/db/structure.sql b/db/structure.sql
index 9545b295297c428ce7348527145ccace7e76269a..1179e5c4355f706265a42d88d8122e1fa5b3ef8a 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -23097,6 +23097,7 @@ CREATE TABLE service_desk_settings (
     encrypted_custom_email_smtp_password bytea,
     encrypted_custom_email_smtp_password_iv bytea,
     service_desk_enabled boolean DEFAULT true NOT NULL,
+    add_external_participants_from_cc boolean DEFAULT false NOT NULL,
     CONSTRAINT check_57a79552e1 CHECK ((char_length(custom_email) <= 255)),
     CONSTRAINT check_b283637a9e CHECK ((char_length(custom_email_smtp_address) <= 255)),
     CONSTRAINT check_e3535d46ee CHECK ((char_length(custom_email_smtp_username) <= 255))
diff --git a/spec/requests/api/project_attributes.yml b/spec/requests/api/project_attributes.yml
index c1270685575ea890576356c799f56b09cf7e3c91..ec98df22af792b22154ad3e2881ae62223faeb39 100644
--- a/spec/requests/api/project_attributes.yml
+++ b/spec/requests/api/project_attributes.yml
@@ -193,5 +193,6 @@ build_service_desk_setting: # service_desk_setting
     - encrypted_custom_email_smtp_password
     - encrypted_custom_email_smtp_password_iv
     - custom_email_smtp_password
+    - add_external_participants_from_cc
   remapped_attributes:
     project_key: service_desk_address