Problem:
¿Cómo mostrar campos de una entrada relacionada superior?

Solution:
Utiliza el atributo id="$parent-slud" en los shortcodes.

Relevant Documentation:
https://toolset.com/documentation/user-guides/displaying-fields-of-parent-pages/

Problem:
¿Toolset soporta 'autocomplete' ?

Solution:
No. Si buscas encontrarás unos cuantos plugins que da este funcionalidad para la búsqueda estándar de WordPress (no la búsqueda de Views), p.j. https://wordpress.org/plugins/wp-autosearch/

Problem:

I am asking about

Example: Custom post type negoci:

Negoci 1 -> to assign to user 1 (this user can edit data of negoci 1)
Negoci 2 - > to assign to user 2 (this user can edit data of negoci 2)

Is this possible with toolset?

Solution:

No, there isn't such a built-in feature within Toolset plugins, but you can try with other workaround with custom codes, for example:

https://toolset.com/forums/topic/limit-the-number-of-posts-submitted-by-registered-customers/#post-368894

Relevant Documentation: