control games objects with kinect v2,Kintect v2 controlling gameobject (installing/detach)

i have a project that i am working on for several months, it is like projection matrix using kinect v2 and rotating and moving the gameobject with hands (empty hands), i have done all of this. i faces some problem with grouping some games objects like origami or lego i don't even know if this can be codeable or not, if anyone got some idea i am open for options... ,i am working on some project where i have to install and detach game object elements like bones and faces, we are using kniect v2 with its SDK for unity and i allready can rotate and move it but i dont have the how to collapse the game object or connect some gameobject to another