Hi @Jack_Hegarty,
Welcome to Airtable Community ! :grinning_face_with_big_eyes:
You cannot change the blue of a multi select field based on a formula. You can however use the IF formula and get the result you need.
As for the Zap, this depends how the data is coming. You can make 2 zaps, each for a different view, one for Wedding and one for Vacation. It will be that if a new record comes to this certain view, choose this item from the list (you would actually not choose it from a list on the Zap, but rather write it and the zap will paste it in the field, and since the item exists in the select options, it will be chosen automatically given it is the same spelling and capitalization)
BR,
Mo
@Mohamed_Swellam does this make more sense:

I want to be able to select an “Options” from the left - based on the value of checkboxes on the right.
@Mohamed_Swellam does this make more sense:

I want to be able to select an “Options” from the left - based on the value of checkboxes on the right.
Yes @Jack_Hegarty , that is what I understood. Seems there was a typo in my answer, I meant you cannot change the value (not sure why it was corrected to blue :grinning_face_with_big_eyes: )
So either change the multi select to a Formula or use ZAP.