setting default kernel in kali linux (submenu)

because I'm familiar with CentOS, i couldn't set default kernel easily in grub.cfg in kali(debian) linux

basically, there is main menu which in turns, includes submenu.

what I want to do is setting default kernel to third entry in submenu within secondary entry in main menu.

here is the example

$ vim  /etc/default/grub

and set GRUB_DEFAULT="1>2"

$ sudo update-grub