For my understanding, it's mainly the reason to have groups:
Group 1 can only see the courses and learning path/documnt you attach to it, course 2 can see it own stuff, but not Goupe 1's one.
In such circumstances, only 1 access addres (and Chamilo) would do it.
If you have several, the you just have to redirect Group 1 & 2 to Chamilo1 and the other URLs to Chamilo2.
This only if I understood what you expected.