and I have a postcode layer. So I have built a new table, like so: ID Postcode C1 C2 1 4445 100001 2 4446 100001 3 4447 100001 200001 4 4448 200001 5 5553 200001 6 5554 200001
now I can join the postcode layer 1:1. After that I used regroup field to build the first table with the polygons (every customer has now a polygon for every postcode). Then I deleted the fields I didn't need (with no attribut for column C2 and using disolve by Customer to create a new shape. The result was the polygon I need, but is there an easier way in ArcMap for doing that - like using model builder?