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Codex " A weapon with this special rule can fire at a different target to the vehicle’s other weapons, but cannot target a unit forced to disembark s a result of a prior shooting attack made by the same vehicle during the same Shooting phase."

BRB shooting "The Shooting Sequence
1. Nominate Unit to Shoot. Choose one of your units that is able to shoot but has yet to do so this turn.
2. Choose a Target. The unit can shoot at an enemy unit that it can see.
3. Select a Weapon. Select a weapon the firing unit is equipped with. All models equipped with a weapon with the same name can now shoot that weapon at the target. Every model that wishes to shoot must be within range of at least one visible model in the target unit. Models that cannot see the target, or are not in range, cannot shoot.
4. Roll To Hit. Roll a D6 for each shot fired. A model’s Ballistic Skill determines what it must roll in order to hit the target.
5. Roll To Wound. For each shot that hit, roll again to see if it wounds the target. The result needed is determined by comparing the Strength of the firing weapon with the majority Toughness of the target unit.
6. Allocate Wounds & Remove Casualties. Any Wounds caused by the firing unit must now be allocated, one at a time, to the closest model in the target unit. A model with a Wound allocated to it can take a saving throw (if it has one) to avoid being wounded. If a model is reduced to 0 Wounds, it is removed as a casualty. Wounds are then allocated to the next closest model. Continue to allocate Wounds and take saving throws until all Wounds have been resolved.
7. Select Another Weapon. After resolving all shots from the currently selected weapon, if the firing unit is equipped with differently named weapons that have yet to fire, select another weapon and repeat steps 3 to 6.

From what I have read above we have the ability to fire at a different unit than other weapons. Now where during the shooting phase do we have the ability to choose the new target? Without rules telling us how it's done we don't have a chance to select a new target.

Edit: How would you do it and is it RAW or is it HIWPI?

Step 2 is where targets are declared - the Codex rule generates a conflict here (an enemy unit vs different target to the vehicle's other weapons) and Codex supersedes.

Let me just do a quick edit. Is it RAW?

I'd say so. You're told you have permission to fire at a target different from rest. That's permission to declare a target. It generates a conflict with step 2 (and cannot be before step 2 as you have to know the rest of the vehicle's weapon target), and you have no permission to resolve it after step 2.

It's always been my understand that exceptions and changes had to spelled out explicitly as to how it is changing the rule.

Gravmyr wrote:
It's always been my understand that exceptions and changes had to spelled out explicitly as to how it is changing the rule.

Only if the base rule says something like "specifically" or "explicitly". If it doesn't, any conflict is enough to change the rule.

If all it changes is the ability to target multiple units wouldn't it also have to change basically every rule from 2 down? Each one speaks about the target unit without an indicator couldn't you shoot at one unit and allocate the wounds to any unit targeted?

Gravmyr wrote:
If all it changes is the ability to target multiple units wouldn't it also have to change basically every rule from 2 down? Each one speaks about the target unit without an indicator couldn't you shoot at one unit and allocate the wounds to any unit targeted?

No, because Step 3 through Step 7 is done on a weapon by weapon basis and each specific weapon will only have one target.

Those rules apply to the unit's shooting. The unit is now targeting multiple units if we select more than one at step 2.

Again, Steps 3 through 7 are dealing with individual weapons, or a group of like weapons. Those rules are for the unit's shooting with the selected weapon. When you reach those steps you would treat Gauss Flayer Array A as a separate weapon from Gauss Flayer B due to having selected different targets for them due to Independent Targeting.

The unit is still targeting multiple units, and no where in step 3 can we change the target unit. While step 7 specifically says "shoot with it at the same unit." So minimum we have to change both of those rules as well correct? So we have to change step 2, to include additional targets. Step 3 so we can change targets for the weapon. Step 7 which restricts us from firing at a different unit. Does this sound correct?

Yes.

Where is it RAW then that we can change the unit's targeting? At best it appears implied.

Gravmyr wrote:
Where is it RAW then that we can change the unit's targeting? At best it appears implied.

There's a conflict - you nominated 2 units as targets. Step 7 says that you can only fire at the original unit.
The weapon is selected to fire, but has permission to fire at the second unit - conflict, codex wins.

Yes. 'Basic versus Advanced' means the codex wins.

Not saying it doesn't. What I'm saying is without a written rule is it not HIWPI?

Gravmyr wrote:
Not saying it doesn't. What I'm saying is without a written rule is it not HIWPI.

... The basic vs advanced rules tell you that when there's a conflict, Codex wins.
We've demonstrated a conflict. Codex wins. Where's the confusion?