importingof zipcode id from csv file.

Hi ,i want to import a csv file for customer is importing .my query zipcode is new for a state its importing the record but i need to add the zipcode in respective table and the customer address i will import zip code to LogisticsAddressZipCode than the address to LogisticsPostalAddress. i am able to import address but not the zip code to respective table.what i need to write?issue in ax 2012.