Issue
I would like to utilize Parent-Child Entity Links in my tenant.
Environment
Registry, Schemas
Resolution steps
If Academic: Academic accounts do not have Registry access, so parent-child entity links cannot be enabled for Academic accounts.
If Industry: This feature is already enabled in your tenant and you can utilize it by going to Registry Settings --> Entity Schemas, selecting the appropriate schema, locating and editing (or creating) the appropriate schema field, and checking the 'Parent Link' box.
Note on making fields a Parent Link + Multi Select: An Entity Link field to a specific Schema can be set to both 'Multi Select' and 'Parent Link'. If the Entity Link is to a Schema category, like 'Custom Entity' or is to 'All Entities', the field cannot be set as both 'Multi Select' and 'Parent Link'.