Migrate related data with the Migration Assistant
You can use the Related data and Related media fields to create one-to-one or one-to-many relations between Sitefinity CMS content types including: dynamic content, News, Events, Blogs, Blog posts, Pages, and others. Sitefinity CMS makes it easy to display all related items on the frontend. For more information, see Content relations: Related data.
In case you have previously used Guid, Guid array, or Media field, you can now migrate their content to use the new Related data and Related media custom fields. To do this, you use the Migration Assistant.
In case you have a Field control with selector for dynamic items, you may need to migrate your content to the new Related data or Related media fields.
NOTE: You can migrate only dynamic modules' content.
GITHUB EXAMPLE: To migrate related data, you can download the Migration Assistant from Sitefinity GitHub » Related data migration.