title: Tableau: Add possible values to a datasource field domain
body: <p>Is it possible in Tableau to add new possible values to the domain of a field in a datasource?</p>
  
  <p>Context: I want to create a group from a given field in my datasource but  I don't have all possible values of it's domain in the datasource. Due to that, Tableau will set the domain of the field as a subset of the actual domain.</p>
  
  <p>I'm using Tableau 10.4.</p>