Sum the Quantity in Look Up Table.

Hi,

I have two table.

Table A:

                    Emp Name     Dept

                    A                         1

                    B                         2

Table B

                    Emp Name     Dept     Salary

                         A                    1     100

                         A                    1     200

                         B                    2     300

                         B                    2     300

Here I look Up Table B, but I need to sum Salary Column for that particular Emp Name,Dept

I am using Lookup_ext () function. DO I need to pull 2 records to main Table and SUM or

Can we SUM up while using Lookup_Ext() function.

Regards.