I would like to sum the if the column have 390, 710, 720 & G, should be dsum
or sumif? Also, i have been used sumif, it's seem too long, pls. advise any
quickly methods? Pls. see the following details:

Class No. of Request
1 5
155 2
391 1
200 4
715 2
720 3
AS 1
D 1
DE 2


The total for the Class (390, 71, 720 & D*) should be 4. Thanks!!