I would like to know how complicated is to grouping everything is just one line.
Let's say
.Group(g => g.Add(c => c.GradeCode))
.Group(g => g.Add(c => c.SizeLength))
.Group(g => g.Add(c => c.SizeWidth))
.Group(g => g.Add(c => c.SizeThick))
Would be instead of having Grouping in (GradeCode > SizeLength > SizeWidth > SizeThick) depth 4, just having a grouping of depth 1 ((GradeCode AND SizeLength AND SizeWidth AND SizeThick) >)
The Kendo Grid does not support the requested behavior. Multiple groups are nested in each other.