Is it possible to have Multiple Header ROW for a BOM Table?

I Understand that we can show/hide the BOM Header by clicking the double triangle/arrow but i cant seem to find a way to add a ROW above/under the header... 

My desired results are as follows: 

A little background/rationale on this request: 

I would like to have only one BOM template, and depending on the need/use case, the user will need to hide/delete the 2nd header row. 

The workaround that i can think of now is to add a line break after the BOM TABLE, but it is not as neat as what i like... 

Thanks.