Hy Antigonie,
as I did just some investigation on filtering master plans and I also believe to remember from a prior task that the filter you can setup at starting of master planing is just used to find the item numbers which will be planned in this run.
So this means for me you can not select only to plan a warehouse which is used in item couverage or a couverage group which is assigned to an item in item couverage. As I'm not as 100% sure for this, may be a any master plan expert can confirm this.
But what is the reason to run the plan for each warehouse seperately?