Definition editor


I'm trying to create a new group of definitions. In sweden we have something I assume is equal to cobie. For us, how are structural engineers that include about 25 different properties that should be named in a special way and placed in one group of properties. 

Some of the properties will have to be modifyed manually and they are easy to add. But some I want to get automatically, but I don't know how to do that. E.g. the length, width and height of an element should be easy to get automatically, but how do I do it? Also the GUID. It's there now, under the properties group. But I want it in my new group as well. Can I do that?