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...and after making a new list, as I do to search for both " Expedientes" and "subsidios Intitucionales"?You don't have a choice. If you need a dropdown menu on multiple lists which have the same values, which you need to add to, then the ONLY way of doing it is to use another list (database table) to store the options. You CANNOT use a dropdown element in this way.
I see you have deleted the list you had started creating?
-- hugh
I have created the new list, and added the first option to it (copied from your existing dropdown).
I have changed the expedientesconcejo___Institucion join element to use it.
Now you need to add rows to the new list (Institutional Listados), and a new row for each of the options you did have as a dropdown. Yes, that will be time consuming, because you have so many options. But that's the whole point of using "lookup lists" instead of dropdowns.
Then wherever you currently would have used that dropdown, use a join element (like the one I set up in line 2 above).
-- hugh