1. A method comprising: receiving a selection from a user of a first field for storing a plurality of source values; prompting the user to name a second field that will store one or more target categories; prompting the user to identify at least a subset of the plurality of source values to map to a target category; prompting the user to name the target category; storing the target category in the second field; and mapping the at least a subset of source values to the target category.