I am trying to create a dropdown list that is populated by values from a custom field type (using acf).
I have a field called "year". And it will have values of 2000, 2001 etc. Clicking on the year will filter the results on the category page (using the category.php template). So It will perform like a search/filter.
So, what would be the best way to go about this. I have looked at various plugins, but cant see any that do the job.