title: How to modify Choice field values (add & remove) without altering the original entries
body: <p>I am working with a SharePoint list that has a "Category" column, which is a choice field, let's just say the categories are A,B,C,D (right now) for simplicity.  At the beginning of the fiscal year (1.5 months) these will not be the same- some additions and deletions will be needed, but we need to make sure the original list values for this field do not change (the ones that have already been entered).</p>
  
  <p>If I modify the Choice field values directly to remove an item, let's say A, will it remove all instances of A throughout the list?  ie. Am I safe to edit this field directly, or should I create a "Historical Category" column to store the old values.</p>