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You can run the command in a subshell and trap on SIGINT running kill 0 to kill the subshell only.

select opt in a b; do
    case $REPLY in
      1)
        (
          trap "kill 0" SIGINT
          sleep 10
        )
        ;;
      2)
        sleep 10
        ;;
    esac
done

• Selecting (1) will let you use Ctrl+c without killing the menu.
• Selecting (2) and pressing Ctrl+c will kill the menu, too.