code: def move_to_folder(self, folder_path, groupby_field_name=None):
          
          try:
              copy_groups_to_folder(self.dicom_groups, folder_path, groupby_field_name)
          except IOError as ioe:
              raise IOError('Error moving dicom groups to {}.'.format(folder_path)) from ioe
docs: Copy the file groups to folder_path. Each group will be copied into
          a subfolder with named given by groupby_field.
  
          Parameters
          ----------
          folder_path: str
           Path to where copy the DICOM files.
  
          groupby_field_name: str
           DICOM field name. Will get the value of this field to name the group
           folder. If empty or None will use the basename of the group key file.