Valve TagNumber to inherit property from Pipeline

I am working with Bentley(R) OpenPlant PowerPID V8i (SELECTseries 5) - Version 08.11.10.202

Our Pipeline Numbers are structured as follows - AREA - COMMODITY CODE + SEQUINTIAL NUMBER - PIPE MATERIAL SPEC + LINE SIZE

For my Valve Number I need to inherit the Pipeline COMMODIT CODE + SEQUINTIAL NUMBER within the valve TagNumber. And if the pipeline number is changed, the valve number needs to be updated automatically, so they should be linked.

I am not at all sure how to do this. The Valve inherits the SIZE of the Pipe Run, but I cannot see in Class Editor how this happens.