Here is an example code:
GPMGMTLib.GPM gPM = new GPMGMTLib.GPM();
GPMConstants gPMConstants = gPM.GetConstants();
GPMDomain gPMDomain = gPM.GetDomain(domainName, DC, gPMConstants.UseAnyDC);
GPMGPO obj = gPMDomain.CreateGPO();
obj.DisplayName = "New GPO";
var strWMIFilterID = "{D715559A-7965-45A6-864D-AEBDD9934415}";
var sWMIFilter = string.Format("MSFT_SomFilter.Domain=\"{0}\",ID=\"{1}\"", domainName, strWMIFilterID);
var oWMIFilter = gPMDomain.GetWMIFilter(sWMIFilter);
obj.SetWMIFilter(oWMIFilter);
Here are some links with more information:
WMIFilters
Active Directory Account
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