Demand forecasting

Hi all,

I have question: For instance there are 3 Sales order each item A and Item B in Warehouse 11. and 5 sales orders each for the same items in Warehouse 12. If Warehouse 12 is considered as the Main warehouse, can a demand forecast be generation per item for the Main warehouse taking into consideration the sales order in Warehouse 11 too. Is it possible to have  a consolidated demand for a main warehouse? 

Please let me know.Thanks in advance for the time.