child/parent elements in a sketch

Hi.
I would like to draw several simple shapes (let's imagine simple squares) in a sketch.
On one hand, I need to place small groups of squares on "virtual planes" or kind of "null objects".
That could allow me to rotate them all at once as if the were on a mother plane.
On the other hand, I need to keep an individual control on each of these squares that could also have their own z orientation.
I don't know if it's clear but in other words, is there a way to make shapes be the children of an other plane...
thanks for any help