In OpenPlant Modeler, reference Pipeline can be displayed with the settings present in project PCF file. By changing the variable value from False to True, will allow user to see the referenced pipeline. By default, it has been disabled, as most of the time it is not required, and also to avoid confusion. However, to review the referenced pipeline, user may change the settings for their project use. Below steps will aid user to get the desired results.
http://communities.bentley.com/products/plant/design___engineering/w/plant_design_and_engineering__wiki/12009.component-openplant-modeler
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