Models to fit Subset by series diagnostics when selected, causes the automatic model selection process to search only over those models consistent with the series diagnostics.
All models in selection list when selected, causes the automatic model selection process to search over all models in the search list, without regard for the series diagnostics.
Models to keep specifies how many of the models tried by the automatic model selection process are retained and added to the model list for the series. You can specify the best fitting model only, the best n models, where n can be 1 through 9, or all models tried.
OK closes the window and saves the automatic model selection options you specified.
Cancel closes the window without changing the automatic model selection options.