Systemd target and services configuration library for Yast
<services-manager>
<default_target>multi-user</default_target>
<services>
<enable config:type="list">
<service>postfix</service>
<service>rsyslog</service>
<service>sshd</service>
</enable>
<disable config:type="list">
<service>libvirtd</service>
</disable>
</services>
</services-manager>
<runlevel>
<default>3</default>
<services config:type="list">
<service>
<service_name>sshd</service_name>
<service_status>enable</service_status>
<service_start>3</service_start>
</service>
</services>
</runlevel>
<services-manager>
<default_target>multi-user</default_target>
<services config:type="list">
<service>cron</service>
<service>postfix</service>
<service>rsyslog</service>
<service>sshd</service>
</services>
</services-manager>
sudo yast services-manager
or
sudo yast services