In Prismic, you can create a one-to-many relationship by putting a Content Relationship field inside of a Group field. This way, your editors can add multiple Content Relationships within one field.

How to achieve this

First, create a Group field. In the Group field, add a Content Relationship field. This allows you to add as many Content Relationships as you want. So one Group field can have many Content Relationships.

How to get linked content from a Group field

FetchLinks does not support the Group field. If you need to retrieve fields from a Content Relationship inside of a Group field, it can be accessed by using the advanced version of fetchLinks called GraphQuery. Here is the developer documentation for  GraphQuery:

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