Hi Jody,
You could include those boards within the same team to group them together, or add a link to Board B on a card on Board A, and vice versa, so that you can easily access one from the other.
Beyond that, there isn't a way to establish a connection between two boards within Trello, although you can automate certain processes between boards using third-party tools such as Zapier or Butler for Trello.
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