Property Groups administration
From OpenKM Documentation
In Property Groups view (this is the way to add metadata to documents) is shown the registered group properties. In this view, new metadata propeties can be registered.
Registering property group
OpenKM 5.1
To register a new property group, simply set the file path in the OpenKM server.
For more information on how to create property groups, take a look at Property Groups in the Installation Guide