Replacement of Flags and Hammocks in P6

With the creation of P6, Primavera has done away with flags and hammocks. We can use LOE bars as hammocks but we do not have a replacement for a flag....that I am aware of. 

In my situation, I have a schedule built that my company uses to manage our work. One of our clients wants their own activity ID numbers and descriptions used when we send the schedule to them for review. In this case, we would create a hammck for their activity bars and set it to read across our activities of which their activity represented. Where they had a milestone, I would change it to a flag and tie it to our milestone for which it represented. When I update my companies activities, our clients activities would be automatically updated because of