To set Pipeline colors based on service and different level as per various template groups such as Piping, Centerline & Insulation. Below steps will aid user to achieve the desired settings.
OpenPlant component symbology is managed in the typical Microstation fashion. It is controlled through a combination of Named Expressions (used to read attributes and assign the Element Templates accordingly) and Element Templates (where symbology is defined for the elements identified by the Named Expression).
"BY_LEVEL_AND_TEMPLATE:" & PIPELINE.NAME & ":OpenPlant\Piping\" & PIPELINE.SERVICE_NAME & ":Model"
"BY_LEVEL_AND_TEMPLATE:" & PIPELINE.NAME & “_CL” & ":OpenPlant\Piping\" & PIPELINE.SERVICE_NAME & ":Centerline"
"BY_LEVEL_AND_TEMPLATE:" & PIPELINE.NAME & “_Ins” & ":OpenPlant\Piping\" & PIPELINE.SERVICE_NAME & ":Insulation"
http://communities.bentley.com/products/plant/design___engineering/w/plant_design_and_engineering__wiki/4870.named-expressions-managing-component-symbology-in-openplant-modeler
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