You can edit the LINENUMBER property directly on the PIPING_COMPONENT class in OpenPlant_3D schema supplemented with OpenPlant_3D_Supplemental_Modeling schema and follow the steps below: Go to NUMBER property on PIPING_COMPONENT class. Add 'Calculated ECProperty Specification' custom attribute and add below expression. this.GetRelatedInstance("SEGMENT_HAS_PIPING_COMPONENT:1:PIPING_NETWORK_SEGMENT").GetRelatedInstance("PIPELINE_HAS_SEGMENT:1:PIPING_NETWORK_SYSTEM").NUMBER Now select the LINENUMBER property and add 'Calculated ECProperty Specification' custom attribute. Add following expression on it. this.UNIT & "-" & this.SERVICE & "-" & this.NUMBER Save the changes and relaunch OpenPlant Modeler. Open the model and select the components which you want to annotate. Go to Utilities>Key-in and apply 'bmech rebuild' command. Hope this helps! Regards, Harpreet
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