AutoCAD P&ID allows acquiring data from other classes. For example the Hand Valves acquire Size and Spec from the Pipe Line Segments.
You can acquire data from your drawing and project properties as well.
Having said this, there are limitations too. Below you see the list from the AutoCAD P&ID Help listing the existing relationships.
· LINE and INLINE ASSET
· LINE and START ASSET
· LINE and END ASSET
· LINE and ARROW
· ANNOTATED and ANNOTATION
· LINE and BREAK
· LINE and PAGE CONNECTOR
· LINE and NOZZLE
· PIPE LINE GROUP and PIPE LINE
· SIGNAL LINE GROUP and SIGNAL LINE
· PIPE LINE GROUP and SIGNAL LINE GROUP (if you manually associated the groups using SLGROUPEDIT).
This list may seem a little to theoretical, especially if you don’t know all the classes and expressions yet. Therefore it’s good practice – even for seasoned users – to sometime just check what works.
Equipment can acquire from:
Inline Assets and Instrumentations from:
Lines from almost everything except from other Lines:
Nozzles from:
Pipe Line Group from:
First thing you may notice is that Spec and Size are not listed (for whatever reason). If a Pipe Line Group acquires data from a Line the value will be acquired only if the multiple segments of the Pipe Line Group have the same value. Otherwise you’ll get a ? as a result.
As the list of relationships above suggests there would be some more screenshots. Just try yourself a little.