Add a single-value field to your data model to store an individual piece of
    information. You can then reference this field on a form to collect a value from users at run
    time. 
    
       For example, you can define a Phone field type and then add it to a
        form to prompt users to enter their home telephone number. 
    
    - 
        Access the data model for a data type or a case type, based on how the field will be
          used in your application.
        
          - To view fields in a data type:
              
              - In the explorer panel of Designer Studio, click
                  Data to display the Data Explorer.
- Click the name of a data type.
- Click the Data model tab.
 
- To view fields in a case type:
              
              - In the explorer panel of Designer Studio, click
                  Cases to display the Case Type Explorer.
- Click the name of a case type.
- Click the Data model tab.
-  Optional:To display fields that are inherited by your
                application, click Show reusable fields.
 
 
- 
        Click + Add field. 
      
- 
        n the Name column, enter a label for the field.  You can modify
          the identifier that is automatically generated in the ID
          column.
      
- 
        In the Type column, select an option from the
            Simple or Fancy category that represents
          the type of data that is stored in the field. 
        
      
- 
        If you are updating the data model for a case type, click Save. 
        
          
         
Note:  Some single-value fields, such as picklists, require configuration before they are
        fully functional. Click the Gear icon to view the available options
        for a field.