Is it possible to create mdbook sub menu items in that will link to an existing page?

Hi folks.
I dont know if this is the place to ask about this however i couldn't think of anywhere better.

Whenever I create a menu (or sub menu item for that matter) theres a new file/folder created for it.
Is it possible to keep main menu items and submenus will reference them by id such as

- [Page 1](
  - [Something in page1](

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