Sum if Condition is Equal in Range Date and find column

[ldiaz]

I want to make a sum if Range is a week number and if style is Equal to
CONC-92 or CONC-45

Week# 49 Week# 50
CONC-92= 27 CONC-92= 30
CONC-45= 27 CONC-45= 30


Datas are in a pivot table and...
Pivot table looks like this:
Date CONC-92 CONC-45 CONC-92 CONC-45
12/7 5 5 10 10
12/8 2 2 10 10
12/9 5 5 10 10
12/10 5 5 10 10



please help