we use Magento 188.8.131.52 i wish to expand the list "orders"(Bestellungen) in the backend. how can i let me show the postal code from the customers there?
Two ways to go, I hope this is helpful:
Quick and easy , but 3rd party extensions
Excellent developer, world class support, and bonus for you based in Germany. Had great experience with other extensions by this company.
http://amasty.com/extended-order-grid.html Will do exactly what you want and more! (no i dont work for them, and have not personally used it, but i know it does the trick) Have had OK experiences with other modules, support more mixed