How can i have all alike product codes in column (A) be matched with
like cities in column (B) and then add the totals that are in column
(C)

Please help me I have 20,000 rows that needs done

Example:

SR1015 New Boston 10
SR1015 New Boston 5 15
SR1015 Coal Grove 5
SR1015 Coal Grove 20
SR1015 Coal Grove 5 30
BD0600 New Boston 30
BD0600 New Boston 10
BD0600 New Boston 10
BD0600 New Boston 10 60
BD0600 Coal Grove 250
BD0600 Coal Grove 50 300