GlobalDefs.xml modification [SOLVED]

Hi,

Whats the best way to make few changes to GlobalDefs.xml, I would like not to copy the whole file just for single line edit, so I do not need to track all changes pushed by game patches.

I am trying to change:

<CustomFactionHomeStarSystemGroup>FactionStart</CustomFactionHomeStarSystemGroup>.

So I can override FactionStart group with my own, for compatibility reasons.

Thanks