How to create a Link Multiple type field

[runtim]

I would like to basically duplicate the Knowledge Base article and categories and re-purpose them but some of the field types are "Link Multiple" which is Not available when creating a field.
How can I create this field type?

[Maximus]

Hello,
these fields are created by adding relation this entity to another. Here you can read more: https://www.espocrm.com/documentatio...-relationships