I am converting a monthly revenue table to a quarterly revenue table. I would
like to add A1:C1 and put it the result in a new cell and then autofill the
cell to the right of it so that it automatically adds D1:F1 for the next value
A B C D E F
1 Jan Feb March April May June
2 10 12 12 13 14 15

Qtr1 Qtr 2 Qtr 3
sum A2:C2 Sum D2:F2 Etc... using autofill
currently using autofill the first qtr is correct "=Sum(A2:C2) but the next
cell gets filled with "=sum(B2:D2) instead of adding the next 3 months.

I appreciate anyone's help!