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 [Article] Import content from Propublica API with Migrate API [Resource] New default 'complete node migration' migrates all revisions including translations [Module] Migrate Plus [Article] Migration Issues [Resource] Upgrading from Drupal 6 or Drupal 7