How To Collapse Rows In Numbers?

How can I collapse (group) a couple of selected rows – not all – with a “button” in Numbers? This is similar to Excel’s Group button. I tried through Categories, but appears to work only with all rows.
I appreciate and value your knowledge and constant support. You are great!!! Thank you!!
I just want to hide/unhide specific rows without having to go to the menu. Like Categories, the firt row will show a summary of “tasks”, but the expansion shows all of them. Unfortunately, Categories seams to include all rows in different categories, I just want a few
—–
Gustavo, from Argentina