@Cristina Larriba i think the way I would do this, is i would create a label called "add checklist", and then I'd create a Butler rule that says "when a label is added to a card, add [the checklist you want to add]."
Then, use the bulk actions power-up to assign that label to all the cards in your board. You can just check the lists, and then apply the label.
Note, if you want to prevent adding this list to cards that already do have it, you would just want to uncheck those cards. (You can tell if i has a checklist already by seeing the "0/4" on a card, like you can see in the above screenshot on "the Finnish way" card.)
If you don't have any other checklists, you could just include a butler command to reset all the checklists and THEN add the checklist you want, and then apply that to all the cards.
Hope this helps!
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