Fix the location and combined data in virtual space

I am working on 3D data and 4D data Virtual reality. I am able to render both models but there are some issues I would like to resolve;

Is it possible to link the 3D and 4D data sets (so that they can be moved at the same time). I did a transform to attach the two data sets but in virtual space when I try to move combined data set (3D and 4D ) it is not locked and both data set move separately.

Secondly is it possible to fix the position in VR space so that when we open the scene in VR that it has the same position every time?

Finally, is it possible to change controller functionality in VR space?