Index match to sum multiple match columns

Hi I am trying to do a 2 WAY INDEX/MATCH FORMULA and return multiple matched columns and sum them up.

The following code works. I was wondering if there is a better way to do it? Also if I decide to Add SalesMonth3, Can it automatically adjust the area to sum up?

=SUM(INDEX(REPORT!$4:$7701,MATCH(A2,STYLE,0)+2,MATCH(SalesMonth1,SALES,0)),INDEX(REPORT!$4:$7701,MATCH(A2,STYLE,0)+2,MATCH(SalesMonth2,SALES,0)))

I'm using the following named ranges:
STYLE =REPORT!$F$6:INDEX(REPORT!$F:$F,COUNTA(REPORT!$F:$F)+5)
SALES =REPORT!$4:$4
SalesMonth1 =InfoSheet!$A$12 (FEB)
SalesMonth2 =InfoSheet!$A$13 (MAR)

I included a sample book.

Thank You!