I think you mean " sitelinks ." Usually, Google does not make it publicly available exactly how they are created (for example, to prevent abuse). I suspect that you need the subpages to be very strongly connected, perhaps at about the same level or more than on the top-level page. It is impossible to know for sure. The best way to get a good website on Google is to make it as user-friendly and user-friendly as possible. I think Google usually searches for clues as to whether the website will be relevant to people and most likely will punish content that distracts from the interface in order to become an optimized search engine.
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