If you are talking about the unique Radio ID number programmed for each radio on a P25 System, yes.
In the Settings Menu, the Disp. Unit ID has to be On.
What I did was create a separate group in my programming software called "Unit IDs". In the Talkgroup column, I entered the six digit number with an "i" in front of the number. (The 96XT series requires the "i" in front of the number). In the Alpha Tag column, I entered a description of what that number was.
For Example (with Unit 8001's mobile radio having an ID number of 180010):
Talkgroup Alpha Tag
i180010 8001 Mobile
(Couldn't figure out how to tab this to align the columns)