Pivot Table- Sumif

Hi All,

I was wondering if any one could guide me how to use SumIf or any other functions while creating a pivot table from excel data in a very presentable manner.
The data shows - sales in qty to various customers for the month of may. Important columns need to be reported are Item, Qty.
On the second tab (in the attached sheet) i am showing the format how i want. I need to sumif by item code and put the total in the respective company column. I could manually do this by SumIf but if I want to do this for month by month for 4 months then how would i do it quickly.
Is there an easy way report for 4 month's comparative figures to make an analysis to see whihc company orders whihc product and the so on...

Some one please help.