How to form in line?

Ok, this is going to sound stupid but how do I do I form my units in line? I know, I know. Im supposed to select them, click on the map and pull to the side. Like in other TW games when the units are already in line this works fine, but when they are in disordered, after a melee surrounding an enemy for example, I click and I cant get them into a line again. In rome I had the same problem until I discovered the formations button, where there was one straight formation. After this I had no problem making lines in Rome. Is there a similar button in napoleon?

If you group units there should be a button for it.