I have some data that I am trying to do a function to calculate. What I want
to say but can't figure it out is.......If the sold to party is X,and the
Category is Y, sum the net price total and return a Z. For instance, if the
sold to party is "1009" and the category is "breakroom", sum the net price
and return $14.18. I want to be able to fill down the formula because the
data I am using is quite large and I have limited time to complete....

Sold-to pt Category Net Price Total
1009 Breakroom $5.89
1009 Breakroom $8.29
1009 Desk Accessories $15.96
1009 Desk Accessories $17.79
1009 File Storage $7.18
1009 File Storage $8.36
2235 Breakroom $235.86
2235 Desk Accessories $8.98
2235 File Storage $32.32
2616 Desk Accessories $1.83
2616 Desk Accessories $13.89
2616 File Storage $13.99
2616 File Storage $10.18
2616 File Storage $11.98
2749 Desk Accessories $0.61
2749 Desk Accessories $1.18
2749 File Storage $5.99
2749 File Storage $5.99