opencase/modules/opencase_entities/opencase_entities.links.action.yml

entity.oc_actor.add_form:
  route_name: entity.oc_actor.add_page
  title: 'Add Person'
  appears_on:
    - entity.oc_actor.collection
entity.oc_actor_type.add_form:
  route_name: entity.oc_actor_type.add_form
  title: 'Add Person type'
  appears_on:
    - entity.oc_actor_type.collection

entity.oc_case.add_form:
  route_name: entity.oc_case.add_page
  title: 'Add Case'
  appears_on:
    - entity.oc_case.collection
entity.oc_case_type.add_form:
  route_name: entity.oc_case_type.add_form
  title: 'Add Case type'
  appears_on:
    - entity.oc_case_type.collection

entity.oc_activity.add_form:
  route_name: entity.oc_activity.add_page
  title: 'Add Activity'
  appears_on:
    - entity.oc_activity.collection
entity.oc_activity_type.add_form:
  route_name: entity.oc_activity_type.add_form
  title: 'Add Activity type'
  appears_on:
    - entity.oc_activity_type.collection