You can approach it from two ways:
A VLOOKUP() or Vertical-Lookup is a database function, meaning that it works with database tables – or more simply, lists of things in an Excel worksheet http://www.howtogeek.com/howto/13780...okup-in-excel/
The function (or combination of functions) I used in your workbook were INDEX/MATCH. It also functions as a database function (when used together), but is more robust than VLOOKUP() in that you can perform matrix lookups http://www.randomwok.com/excel/how-to-use-index-match/
The lookup essentially takes a cell, looks through a range of cells for a match to the previous cell, and returns the value of a cell associated with the initial range (within the same row/column).
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