In Power BI, it is not possible to add group headers.
As a workaround, you could unpivot table structure first in Query Editor mode. Then, add a calculated column to group original field names (which are listed in a new single column). Then, use a Matrix visual to display data.
Community Support Team _ Yuliana Gu If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.