Is it possible to relate two or more posts of the same type between them?
Kind of "Related posts" to one post. I don't want to achieve that using the taxonomies, I want to specify the posts in the backend like we do when are two different types of posts.
Where you specify that is not possible with toolset, but both of them are old (2016) and I was wondering if it's possible to do it right now.
To be honest, I don't understand how can apply the "parent" and "child" solution for my special case. I just want to do it like we do in WooCommerce for example (related products).
Unfortunately no this is not possible to achieve with our plugins. The only way I can think of relating products together is by using taxonomies, so that you can use similar taxonomies to group your products.