Hi Leema,
Do you want to hide the ChildTable Header? If yes, you can use the ShowHeaders property of the child hierarchylevel to hide/show the column header in a grid.
GridHierarchyLevel childrenLevel = gridDataBoundGrid1.Binder.AddRelation("Parent_Child");
childrenLevel.ShowHeaders = false;
Please refer to the attached sample for implementation.
MasterRelationReset.zipBest Regards,
Haneef