=SUMIF(SHIPPED!$A$3:$A$13,A2,SHIPPED!$B$3:$B$13)
I would like for the formula to change to what is in A1.. If I change A1 to C, I would like for the formula to replace A with a C in the formula.
SUMIF(SHIPPED!$A$3:$A$13,A2,SHIPPED!$C$3:$C$13)
Thanks