The Group Editor window allows you to set group properties which are:
Group name
Set name of the new group.
Group ID
Specify an ID for the group. This is normally not necessary, but may be useful
if you need to recreate a group referenced in the permissions of some object.
If this is not specified, the highest assigned group ID plus one (with a minimum
of 100) will be used as default.
See also:
Setting Group Member(s)