How to overwrite the default Scalability with any configration file

How can I change the default Scalability just like create something new configration file in config forder.
and it will change the default Scalability everytime I openning game.

and if it can be. please give me a simple example(screen shot) for how to write the configration .

Put in your %platform_specific_path%/GameUserSettings.ini file a section like this:

[ScalabilityGroups]
sg.ResolutionQuality=50
sg.ViewDistanceQuality=1
sg.AntiAliasingQuality=1
sg.ShadowQuality=1
sg.PostProcessQuality=1
sg.TextureQuality=1
sg.EffectsQuality=1

These are “Middle” settings. For explanation, try this page.