My code is:

var helper = new DomHelper(_dms.SendMessages, "operational_system_configuration");
var filter = DomInstanceExposers.DomDefinitionId.Equal(Operational_System_Configuration.Definitions.ProtocolResourceTypeMapping.Id);
var currentMappings = helper.DomInstances.Read(filter);
var pollingIpsLookup = currentMappings.ToLookup(x=>x.Name, x=>x.Sections.First(z => z.SectionDefinitionID.Equals(Operational_System_Configuration.Sections.ProtocolResourceTypeMapping.Id)));
var rows = pollingIpsLookup
.Where(group => group.Count() > 1)
.SelectMany(group => group, (group, element) => new GQIRow(new[] {
new GQICell { Value = group.Key },
new GQICell { Value = element.GetValue<string>(Operational_System_Configuration.Sections.ProtocolResourceTypeMapping.ProtocolVersion) },
new GQICell { Value = element.GetValue<string>(Operational_System_Configuration.Sections.ProtocolResourceTypeMapping.ResourceType) },
}));

return new GQIPage(rows.ToArray())
{
HasNextPage = false,
};

I want to group by the Key and then show remaining.
Actually I need to go and group it on table everytime then it is fine, but I want to show each time grouped, something like this