Group->Create creates a new group.
Group
The 
Group entry provides a name for the group object. 
This is optional: when empty (or filled with separator characters, 
as space, tab, newline), the group will be named Group.
Object identification is explained in 
Introduction Identification.
A group is a container whose primary purpose is to contain other objects.
When a group is created, it has no child objects and consequently no visual
representation. The only way to select an empty group is therefore to write
its identification or to use the mechanisms provided by 
Group Select.
To avoid this problem, when 
Ok is pressed and the new group is created, 
the 
Group Create dialog is automatically replaced by the 
Group Link 
dialog, with the new group identification already inscribed on it. How to link 
objects to a group (TODO) is described in the section 
Group Link.