Yes. You can name any agency or talkgroup whatever you like. So, you could edit any of the three lines of info (System, Dept, Channel) in your programming.
I wonder if the SDS200 display software has been updated since the Easier to Read Manual was written? Here are a couple of changes that I have noted with the local NXDN systems near me in Upstate NY:
NEX9 appears if the channel is receiving a 9600 NexEdge system NEX4D appears if the channel is receiving NXDN 4800 Direct Frequency Assignment *