CentOS - Nov 2019 - 40_custom be the default option

Hi All - I have my 40_custom file setup. What is a good way to make that
the default boot option ?
I'd rather not count menu option lines and change GRUB_DEFAULT to that - as
I am doing this remote.

Thanks

Jerry

I finally found it... use the --id "name" on the menuentry
and change /etc/default/grub GRUB_DEFAULT=name
Sorry for the noise.

Jerry