A group of a group is called a child group.
The relation is defined through the use of the children key word.
Create a group of a group relation using :
Example: The group parent1 has two children group1 and group2
[childgroup2]
host1
host2
[childgroup1]
host2
host3
[parent1:children]
childgroup1
childgroup2
all:
children:
parent1:
children:
childgroup1:
host1:
host2:
childgroup2:
host3:
host4: