Siemens SIMATIC PCS 7 Configuration Manual page 69

Using OS reference clients
OS reference clients are always used when all settings on several OS clients are identical.
Each configured OS client can be used as a basis for further clients. Creation and maintenance
efforts along with the project scope for operator stations are reduced considerably as a result.
In the example project, the stations "CLIENT03" and "CLIENT04" should be identical to station
"CLIENT02".
Compendium Part A - Configuration Guidelines (V8.2)
Configuration Manual, 08/2016, A5E38166869-AA
Creating and managing a PCS 7 project
5.5 Adding Additional Stations
69