(Find + Replace the below badge links from "symbiote/silverstripe-gridfieldextensions" to your packagist name)
Data transfer is a data management module for developers and content authors. It uses JSON format to import and export data to keep your data synchronised from production site to test site. With Data Transfer, you no longer need to redo rebuilding your pages and elemental blocks on your site.
composer require symbiote/silverstripe-datatransfer:~1.0
- SilverStripe 4+
- Multi Value Field] ^5
Head to data transfer > Data export tab, as image below suggests: