root@foo:~# systemctl status myglobal.target
● myglobal.target - My global target Bootstrap
   Loaded: loaded (/lib/systemd/system/myglobal.target; enabled)
   Active: active since Tue 2015-12-22 08:55:13 UTC; 10min ago

Dec 22 08:55:13 localhost systemd[1]: Reached target My global target Bootstrap.
root@foo:~# cat /lib/systemd/system/bar.service
[Unit]
Description=bar
Requires=baz.service
After=baz.service

[Service]
Type=oneshot
ExecStart=/usr/sbin/bar
TimeoutSec=0

[Install]
WantedBy=myglobal.target
root@foo:~# systemctl status bar.service
● bar.service - bar
   Loaded: loaded (/lib/systemd/system/bar.service; enabled)
   Active: inactive (dead)
root@foo:~# ls /etc/systemd/system/myglobal.target.wants/
baz.service bar.service
root@foo:~#