To remove the letter or Attribute from the drop down box, follow these steps:
  1. Click Config
  2. Select Letters or Attributes
  3. Highlight the desired code
  4. Mark as Active (Letters will need to first be opened to access this box)
  5. Open a different module, such as Records or Query
  6. Return to Config and again mark the code Inactive
  7. Open a constituent record to confirm the code is no longer listed in the drop down menu
Note:  If the code is currently in use on a record, the code will continue to appear in the drop down menu as an option.  However, it will not appear on records that have not already used the code.