Hi @Claire_30,
Welcome in the Community !
You could use the option Convert Labels to Codes and Codes to Labels by selecting your columns, then go to menu "Col", then "Utilities", and then "Labels to Code". Example on "Big Class Families" dataset by selecting column "name" :

Hope this answer will help you,
Victor GUILLER
"It is not unusual for a well-designed experiment to analyze itself" (Box, Hunter and Hunter)