Crystal from Trello Support here!
While Trello doesn't support board nesting you can use a few different workarounds to achieve card/board syncing!
You can add a link from one card to another to show a preview of the board and refer back to it easily. Here's a guide on that: https://help.trello.com/article/824-sharing-links-to-cards-and-boards
You can also use these third party Power-ups to keep cards in sync:
@getjonIn Trello there is no "direct" nesting of boards into boards.
However you can link to another card/list/board, and in that sense include information from another board in the current board.
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