Link Types in DoorsNG - why do I have more than I can use

A set of system-defined of link types are built-in when a RM project is created. Whether they become available for selection depends on what other projects are associated with the project. For example, the Elaborates/Elaborated By link type is available only through an OSLC integration with UNICOM Focal Point. See this document for more details.
https://www.ibm.com/support/knowledgecenter/en/SS2L6K_6.0.1/com.ibm.rational.rrm.help.doc/topics/r_linktypes.html

 in the Manage Project Properties window there is are link types and link constraints. This is where link assignments are defined.

I think you misunderstood my question ..... I have a full CLM project enabled, the template chosen at the time of creation would have been Use Case for the DoorsNG piece ... I see a lot of link types in the project properties including those of which I mentioned above e.g. the Elaborates/Elaborated By, Derived from / Derives .. but no matter what artifact type I create, the link options do not include these as selectable values. 

There are no link constraints defined.