Convert system to multiboot to test rawhide

[R Mercado]

Hi,

I was reading https://fedoraproject.org/wiki/Releases/Rawhide where it
mentions that one suggested way to use rawhide is to use it 

"On a multiboot system, alongside a stable release of Fedora or another
operating system".

Is there a guide to convert a stable Fedora system into a multiboot
one?

Thanks,

R Mercado