code: def remove_work_item_type_field(self, process_id, wit_ref_name, field_ref_name):
          
          route_values = {}
          if process_id is not None:
              route_values['processId'] = self._serialize.url('process_id', process_id, 'str')
          if wit_ref_name is not None:
              route_values['witRefName'] = self._serialize.url('wit_ref_name', wit_ref_name, 'str')
          if field_ref_name is not None:
              route_values['fieldRefName'] = self._serialize.url('field_ref_name', field_ref_name, 'str')
          self._send(http_method='DELETE',
                     location_id='bc0ad8dc-e3f3-46b0-b06c-5bf861793196',
                     version='5.0-preview.2',
                     route_values=route_values)
docs: RemoveWorkItemTypeField.
          [Preview API] Removes a field from a work item type. Does not permanently delete the field.
          :param str process_id: The ID of the process.
          :param str wit_ref_name: The reference name of the work item type.
          :param str field_ref_name: The reference name of the field.