Hi Matthew,
thank you for your reply.
Well, at design development stage we normally don't change levels. It happens mostly during Concept and Sketch Design stage, where you want the ability to raise or drop the whole building to fit under height limits, optimize excavation and so forth.
In saying that though, it happened to us that we had to drop a whole building by 600mm because the lift needed a higher headroom over and was going over the height limit.
Also... sometimes there are things that people do that you cannot understand and would be great to be able to lock in place all the existing retained/fixed information.
Glad to hear that someone else is using the screen shot, thing is that at the beginning all the fields are empty