I am working with Primavera P6. I have a new project with a defined WBS. I want for each level of the WBS, when I create a new activity, have a default Activity ID previously defined, for example:
WBS:
PROJECT
Engineering
Mechanical
Civil
Piping
...
Procurement
Manufacturing
...
Construction
Area 1
Area 2
...
And for each of these WBS groups, when I create a new activity on it, I dont want the typical A00000 Activity ID, instead I want for example PR1ENME001 (PRoject1, ENgineering activity, MEchanical and is the 001 activity)
So here's the trick.
First create at least 1 activity with your desired Activity ID pattern in each WBS area. Then, highlight that activity and create a new one. It should copy the pattern to the new activity and increment the IDs number automatically.
But there is a setting for this.
On the Projects window, find your project, highlight it, and find the Defaults tab in the bottom half of the screen. Make sure the option "Increment Activity ID based on selected Activity" is checked on.
If you want to edit existing IDs to match your pattern, then you can either use Edit->Renumber Activity IDs, or you can use a Global Change - here's how https://www.planacademy.com/tutorials/edit-activity-ids-primavera-p6-via-global-change/