how can we insert a list of country fields in odk in an automatic way
Hello @diniero69 , I understand that you just want to display a list of countries in a given question,
you first got to, create the question, and make it a select one type or select multiple,
Then create a variable like countries, and in the choices sheet you have to put the countries you would like to display on the column next to the variable it would look like : country Honduras Honduras,
here is a link to the documentation maybe this can help more: https://docs.getodk.org/form-question-types/#single-select-widget,
if you are trying to use cascades in options like, countries, then states or something like that you need to do this: http://xlsform.org/en/#cascading-selects.