Follow the step of new heat traced pipeline in PID V8i version, open pidprojectsymbols.dgnlib file in PID up9 of CE , customize cannot be edited；As shown below：
SO How to add a new pipeline style in CE up9
Thank you for posting your query on Bentley Technical Forum.
Well we have observed the same issue recently and we are investigating upon it and as soon as we get any outcome we will update you.
Hello Li Han,
You can edit via Customize ribbons tool in CONNECT.. for more detail steps please refer following wiki and videos as well.
Hope this helps.