I don't really think that is possible from within the App itself, but I suggest this;
Copy the board links and add to each of their respective cards as an attachment, in thatyou can easily navigate from the card to the main baord.
I hope this helps
@Nelson_Corbo this "board of boards" is the second example I provide in my introduction to Trellinator:
Hello Community! My name is Brittany Joiner and I am a Trello enthusiast and Atlassian Community Leader. I'll be sharing with you a series of videos with my top tips on how to best use Trello...
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