As per project requirement custom components are required which are not available in library by default. Modeler have the flexibility to use existing class and define it for custom component. In OpenPlant Modeler use existing class for custom component can be done by adding custom attribute “Use Class as Custom Components” under OpenPlant_3D_Supplemental_Modeling. Below steps will illustrate one if the existing class use and to enable it to show in drop down list under custom piping component builder dialog box.
If above problem still persists, then please create a Service Request and contact the Bentley Product Advantage group. Please include a list of all relevant details to get in depth analysis for a solution or workaround