Index and Match Error

Hi All,
At Site A, I have the Qty for each product and store.
At SiteB tab, I have SiteB qty as well. But at Column D on site B tab, I want to display Qty information from SiteA as well.
i.e I want to know the qty from SiteA at Column D, based on the Combination of Prod and Store. (Using Index and Match Method)

Any help is appreciated!

Regards,
Nironto