You can add services to OES servers after they are installed.
OES is a set of services that can be either added to an existing server or installed at the same time as SUSE Linux Enterprise Server. After OES services are added, we refer to the server as an OES server.
To add OES services to an OES 2015 SP1 server, follow the instructions in Installing or Configuring OES 2015 SP1 on an Existing Server
in the OES 2015 SP1: Installation Guide.