Thanks for you reply.
First of all, the table posted is what I want. I don't know how to get it yet.
Secondly, I have to group by SKU because still there are details inside SKU. What I mean is that for each SKU, the Sales$ field is a summary. That's why I still need to group by SKU.

I have searched on Internet and lots of people mentioned this problem. some perple implemented it using formula in the group field. I don't how to do that.

I appreciated your guide if you could give me some suggestion.

Bruce