Hello Tony, thanks for your answer.

The subgrid (and sub-subgrid for the matter because I need at least 2 nesting levels) wouldn't fit because

• Groups are solely label (no need for X columns), not a master-detail scenario
• I need the column of the main table to match the nested data (buyorder attributes in my example).
• I don't want the columns header of nested data to be repeated for every nested group

Line breaks are just rows with a single column (and according colspan),

see