Chris,
IT Shared Services are not an object in the CMDB and thus not a direct part of the CSDM. These IT Shared Services are ITFM objects utilized to create automated cost rollups for the business.
Within the CMDB we focus on providing a portfolio of Services and their relationships to other Services.
It is important to have a definition of "Shared". That definition may or may not reflect a technical representation of relationships documenting what services consume the Shared Services.
Showing the "share":
The CSDM within the CMDB has the value proposition of showing where shared services are consumed by other services. Shared Services are not specifically "labeled" in the Common Service Data Model. They may be built out like any other service within the CMDB as either Technical Services, Application Services or Business Services that happen to be shared. Using relationships created through Service Mapping or manual effort you can see where your services depend on other services thus displaying a "shared" service. Showing the "share" then enables business to see where services are utilized and thus validate financial modeling.
It sounds like there may be value in identifying a Service in the CMDB as "shared".
Hope this helps.
