You can split your troopers up into 2 more different squads. To do so,
highlight the soldiers you want to split up, and then press the snake picture
above the soldier names. Keep in mind that new squads can take grenades and
bazookas. To change how many the new squad takes, toggle through the yellow
lines that appear around the grenade and bazooka icons. A solid line represents
all of that particular item. A dotted line is half, and no line is none of the
item. After you create separate squads, you can regroup them by moving the
troopers into each other.
источник - gamefaqs
