Drupal migrate extensions, extra plugins. Recommended Yes Module page https://www.drupal.org/project/migrate_plus Module tags #Extension Stability Stable Tags #Migration Issues Document how to append a value to a reference field Articles Upgrading Drupal Sites Module issues Document how to append a value to a reference field #Migration [Module] Media Migration [Article] Media Migration With Sequential IDs [Article] Override local migration config [Article] Upgrading Drupal Sites [Article] Migrate URL Alias With Sequential IDs