I don't know how to do this, but I am positive there is a way.
I have a feature class that has a set of data that represents location and related data. I have a table (currently in excel) that shows multiple entities with its descriptive data and a field that indicates which location it is at. This one field has the same entries as the feature class. This would be a many-to-one relationship. I cannot figure out how to create a new feature class that merges the entities table with the location data of the corresponding feature class.