There is a "OdPrcPointSet" class. Example code can be found here : Prc\Examples\OdPrcCreate\RepresentationItemExample.cpp see OdPrcRepresentationItemPtr CreatePointSet(OdPrcFileStructure &newStructure).
Also you can start OdaPrcApp.exe; and few steps:
- File/New
- Tool/Load Applications
- load OdPrcExCommands.tx
- Edit/Registered Commands/Prc create example/RepresentationItemPointSet
- Vectorize it