This is about the best official documentation you will get:
http://fortresseuropemod.com/scardoc
You can use a Game Event to trigger on the death of a Squad, then create a new Squad that is identical to the one that died. The only difference will be ID, which is not visible to players.
Everything in the game has an ID and an Object, including Players. The ID is a number, while the Object is what is referred to in Player_ functions (even though it is sometimes called an ID there, too).