Look up and adding the correspondent quanties

Hi,

I have a database in Excel 2003 with two columns, almost 11,000 rows
one column with item codes, many in multiple cells, second column indicates quantity,
Can somebody help me with what functions can I add the quantities for the items showing in multiple cells, and have only one row showing the result,
Example:

AC-BN-BAN01 16500
AC-BN-BAN01 9000
AC-BN-BAN01 12500
AC-BN-BAN02 3
AC-BN-BAN05 9
AC-BN-BAN05 600
AC-BN-BAN05 600

I need to have only this info:
AC-BN-BAN01 38000
AC-BN-BAN02 3
AC-BN-BAN05 1209
etc

Thank you
A