Here are the steps :-
1. Open the Powerpivot window and click the Diagram View Button.
2. Now you need to create a relationship between Zip column of Mapper and 118 tables.
3. For that, you need to Left click , hold and drag the Zip Column in the Mapper Table on the Zip column of the 118 Table. You can google on how to create relations on powerpivot. FYI, that would be a One (Mapper) to many (118) relationship between the two tables.
4. After you established the relationship, you need to pull the Clusters on the 118 table. For that, use the Related function.
Add a column with above formula.
These were the steps. After that, you would be able to pull down a pivot having all the columns including new Cluster column.
Hope this suffices.!!
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