How to make sub-items in the search engine results?

Question

Google

Tell me plz, how is the issue in the search with sub-items achieved?

Answer 1

only good catalog structure and semantic markup :)
observe the number of h1 and h2 on each page, be sure to make breadcrumbs with micro-markup. make microdata in the directory. make a normal CNC and write canonical on the catalog pages. monitor server responses so that there are no unnecessary redirects.
and someday you will be lucky, and Yandex, believing your site, will add snippets to it in the search results.
or not.

Answer 2

Everything Dimitri said is correct. You also need to be "big" according to Yandex and with a large CTR from the issue.