Master plan by site?

Hello everybody! I want to have my item proposals in AX2012 by requisite in some sites (they only sell) but in my manufacturing site I want to have a Period method so I can group in periods of 90 days the demand of the selling sites.

But I didn’t find where to assign parameters for the same item, in different site? Anyone can guide me? I have only one company with different sites.

Many thanks!

The item coverage records from the item record. Plan action pane. On the general tab you have all of the override flags.

Thanks AdamRoue!