|Spatial Manager / Managing WMS Layers and Configuration|
Select Spatial Manager to view, create, edit, move, organize, and delete the layers for the Web Map Service and its capabilities.in
The WMS layer tree defines the layers that are exposed through the WMS and also defines the structure of how these layers are organized. Only the layers defined in the WMS layer tree are returned in a GetCapabilities response, and can be returned in a GetMap or GetFeatureInfo request. There can be only one WMS layer tree at the root. That root layer can have any number of children, as can any of those children.
See Web Map Service (WMS) in the Services section of the Spectrum Spatial Guide for more information.