It sounds like you could use =sumif().

Debra Dalgleish has lots of info on counting and summing at:

http://www.contextures.com/xlFunctions01.html
and
http://www.contextures.com/xlFunctions04.html

RITA wrote:

In a spreadsheet, I have a value which appears more than once in different
rows in a table array. I need to do a vlookup which checks the value in this
table array and sums up the amounts in an adjacent column applicable for this
value. Can I achieve this?
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rITA

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Dave Peterson