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In WM do the troops within a unit(such as Trenchers, Winterguard, etc.) have to attack the same target(i.e. warjack, enemy unit) or can they divide their fire amongst different targets?

nope. each model targets and may be targeted individually.

The unit has to activate together, so all move and then all take their action, but their actions are separate. All the models in a unit don't even need to do the same action. For example, some models in a unit could make melee attacks (if in melee range), some could make ranged attacks (if not in melee range), and some could make actions (like a trencher dropping a smoke bomb).

Now, if the unit receives an order - such as Charge or Run (or special orders like assault or cautious advance), then all the models need to perform that order. But, they can have separate Charge targets - they all have to charge, but not necessarily the same model or unit.