In OpenPlant Modeler, there are only few classes which can be used to create custom equipment from custom component builder as shown below. In this article we will discuss the steps required to add more (Existing/New) classes to the list.
For this example, we will add BLOWER class to the list in custom component builder dialog.
http://communities.bentley.com/products/plant/design___engineering/w/plant_design_and_engineering__wiki/19632.how-to-use-existing-class-as-custom-component