You can also use the Outliner! 😉
Here a moving a Group named "Cylindre" to an element of a general Group named "Ensemble"!
GIF_acyl.gif
arbo.jpg
And then use the cool free Real Time SimLab Composer Lite Vf (maxi 1920 * 1080)
(texture with the free cool onlineSumoPaint ! ☀
sumo2.jpg
https://s6.postimg.org/6ne7tnpn5/sumo3.jpg