CONNECT Edition 10.11.++
If it is required to create a class similar to another existing class, then a Child class can also be created in that case.
Save & close
Open .mdb file of Specification located at C:\ProgramData\Bentley\OpenPlant CONNECT Edition\Configuration\WorkSpaces\AsperProject\WorkSets\AsperProject\Standards\OpenPlant\Specs\AsperProject.mdb,
Add EC_CLASS_NAME as PIPE_NIPPLE_REDUCER and required data in relevant column, Save & Exit