I documented this in the manual. See "standalone multi-OS setup"

On Wed, Apr 12, 2017, 09:27 Leslie Satenstein <leslie.satenst...@gmail.com>
wrote:

> Current-Setup
> =============
> SYSTEM-A Grub2 >-----+ Points to A,B,C,D,E
>                      +-->SYSTEM-B Grub2 Points to B,A,C,D,E
>                      +-->SYSTEM-C Grub2 Points to C,A,B,D,E
>                      +-->SYSTEM-D Grub2 Points to D,A,B,C,E
>                      +-->SYSTEM-E Grub2 Points to E,A,B,C,D
>
> Problem
> =======
> any update to A,B.C.D.E needs a recreation of grub.cfg for each (all)
> the others
>
>
> Is it possible to do the following?
>
> SYSTEM-A Grub2 >-----+A,[MASTER=Grub2]
>                      +-->SYSTEM-B Grub2 Points to B,[MASTER=Grub2]
>                      +-->SYSTEM-C Grub2 Points to C,[MASTER=Grub2]
>                      +-->SYSTEM-D Grub2 Points to D,[MASTER=Grub2]
>                      +-->SYSTEM-E Grub2 Points to E,[MASTER=Grub2]
>
> [Master-Grub2]
>      Copy of all Grub.cfgs, neatly organized?
>
> Any update of any system must also update MASTER-GRUB2
>
>
>
> _______________________________________________
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> Grub-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/grub-devel
>
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