Change the Activity ID of Various Series of Activities in P6.2

Hi Fellow Planners,

I am using P6.2.

I have a lot of series of Activities strating with CS-A-PS-C-, CB-A-PS-C-, and so on with the activity number ending in 4 numeric digits 1000, 1010 and so on.

 CB-A-PS-C-,   CB-A-PS-C-,  CB-A-PS-C-,  CB-A-PS-C-,  CS-A-PS-C-, CS-A-PS-C-, Please can some one tell me how to change the last 4 digits of these activities in order to be sequentially according to there work package (WBS) and Early start. I would prefer some kind of a Global change.

Many Thanks

Pranab