Not that i can see. I can select all of my objects but cant see how to move them all down by exactly 11.133301 in the z axis in respect to their initial position.
if you put -11.133301 in the transform box it moves everything to the location -11.133301 not the origional location minus that amount.
Hm, there are 2 options,
Take each model per hand, take the location of the Z you wanna change, put it in for each and its done.
Sadly you cant take serveral models and just type in the change, but you can set up and … a visual clue where your wished for hight is, and than select all models and move them to the hight you want to have them.
There is a simple way to do this, took me a while to figure out but…
Select all the objects you want to move, enable snap to grid and set the gridsize to the distance you want to move the items. Now you can move them very easy by exact distances.