Report Table design issues

Hi,

I am currently working in report which looks like,

Configuration done:
image
if u see here
Category 3 has max rows (9)
others has less than this
is there a way to append empty rows to other table until it matches this row

or how can we leave a space
My expected result:

See if you can do "nested tables". I have no idea if it's possible.

I'm guessing this didn't work?

Yes !!

do you guys have any solution or alternative approach to this?