You can just add another criteria to the existing sumifs..

In C11:
=SUMIFS(INDEX('SKU Details'!$A$32:$VY$2003,0,MATCH(C$10,'SKU Details'!$A$23:$VY$23,0)),'SKU Details'!$T$32:$T$2003,$A11,'SKU Details'!$O$32:$O$2003,$B11)