Hi,
You can add/remove columns from the VisibleColumns collection or you can set the GridColumnDescriptor.Width = 0. Here is a code snippet.
GridRelationDescriptor parentToChildRelationDescriptor = this.gridGroupingControl1.TableDescriptor.Relations["RelationName"];
parentToChildRelationDescriptor.ChildTableDescriptor.VisibleColumns.Remove( "ColumnName" );
Sample :
MasterChildFormat.zipBest Regards,
Haneef