[CentOS] Hiding a grub menuentry?

Does anyone know if it is possible to 'hide' a grub menuentry with 
CentOS 7 ?

I have a custom menuentry that I don't want to be seen on the grub 
screen - but it needs to be selectable as the entry to boot via 
'grub2-reboot'

I've scanned the grub2 documentation - but I can't find anything obvious 
- so I'm guessing it can't be done - unless someone knows otherwise ?

Thanks

James Pearson