Here are the general steps to import contacts into Zammad:
Export your contacts data into a CSV file. Make sure that the file includes a header row with the names of the columns that you want to import.
Log in to your Zammad account and go to the "Admin" menu.
Click on "Import" and then "Contacts"
Click on "Choose File" and select the CSV file that you exported in step 1.
Map the columns in your CSV file to the fields in Zammad. This will ensure that the correct data is imported into the correct fields.
Click on "Start Import"
The import process may take some time, depending on the number of contacts you are importing. Once the import is complete, you should see a message indicating that the import was successful.
Please note that the steps may vary depending on the version of Zammad you're using. It's best to consult the Zammad official documentation for more information on how to import contacts.