Hello everyone!

Could you please advise me how to describe the variables in a SARIMA (1,1,1)(1,1,1)4 from the quick-estimate equation?

My time series data is called "gva" (gross added value). The model is with and without a constant. For the differencing I use d(gva).

So, I write the following code: d(gva) ar(1) ma(1).....but I don't know how to continue for seasonal part.

I read the eviews docs and watched all youtube tutorial but couldn't anwer myself. Also I could't find alternative way to define sarima without using AUTOarima functin, I prefer manually.

Many thanks in advance