hey

is it possible to make 4 units travel together until the last one dies?

eg. republic commando

You could do it through scripting by telling the three other AI bots to follow the 4th bot. You will have to reprocess the AI goals each time the leader of the pack dies, so another bot becomes the leader.

There is a limit to the amount of AI goals active in a map (maybe 20? I can never remember...)