g group obj1 obj2 ..... objn
This command creates or appends to a combination record and is used to group objects together either for editing or displaying purposes. In this case, "obj1" through "objn" are added as members to the combination "group". If "group" does not exist, it is created and "obj1" through "objn" are added as members. NOTE: no checking to see if "obji" is already a member of "group".
Examples:
g shell hull turret
g tank wheels engine crew shell
g tank track