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I read this: Display posts of custom type in hierarchical order But didn't understand if and how to use the answer.

I read this: Display posts of custom type in hierarchical order But didn't understand if and how to use the answer.

This what i would like to achieve:

I read this: Display posts of custom type in hierarchical order But didn't understand if and how to use the answer.

This what i would like to achieve:

Customer 1 (parent) the_title() - the_permalink() - edit_post_link()

No problems in backend:

Customer 1 (parent) the_title() - the_permalink() - edit_post_link()