auto_model = AutoARIMA(....)
fitted_model = auto_model.fit(train['y'])

# The parameters
p, q, P, Q, m, d, D = fitted_model.model_['arma']
# use them as inputs in a ARIMA model
auto_model_saved = ARIMA(order=(p, d, q), seasonal_order=(P, D, Q), season_length = m)