# Multiple Hosts:
define service{ host_name HOST1,HOST2,HOST3,...,HOSTN service_description SOMESERVICE other service directives ... }
# All Hosts In Multiple Hostgroups:
define service{ hostgroup_name HOSTGROUP1,HOSTGROUP2,...,HOSTGROUPN service_description SOMESERVICE other service directives ... }
# Excluding Hosts:
define service{ host_name HOST1,HOST2,!HOST3,!HOST4,...,HOSTN hostgroup_name HOSTGROUP1,HOSTGROUP2,!HOSTGROUP3,!HOSTGROUP4,...,HOSTGROUPN service_description SOMESERVICE other service directives ... }