Thanks Alex. My apology for not being more clear.
I have a custom field with a list of U.S States (50) and one extra value of “All” (1). 51 values total.
This field is set as a filter in the CPT search. No problem there. All works fine. However, when someone searches say “TX” for Texas, we need to filter on all records that have the value of “TX” OR “All”.
I recognize that this is geographic in nature on the surface but there will be other similar dropdowns that are not geographic values where there will be and “All” type value.
If I was writing my own code, I would just append some like “or area=’All'” to any queries. That’s why I was asking about a hook that I could modify the query logic or similar approach.
Thanks