In the Core Rulebook for Wrath & Glory 2nd edition, the rules about attacking state the following:
Attacking
Normally you make one attack per Round using your Combat Action. Special actions such as Multi- Attack allow you to attack more than one target, while options such as All-Out Attack or Salvo help you to target a single foe more effectively.
Multi-attack rules:
Multi-attack
Multi-Attacks work similarly to Multi-Actions; every additional attack increases the Defence of every target by +2 for the purposes of the Multi-Attack. Each attack of your Multi-Attack must use the same weapon, and you cannot Shift as part of a Multi-Attack. Roll damage once, and apply the result to every target hit.
When fighting a "Mob"-type enemy (which is composed of several entities), it acts as a single entity. Thus can it be multi-attacked or only once per character turn?
Best Answer
Yes even non mob targets
The attack states that you can use a multi attack to attack different targets but you do not have to do that. The multi-attack does not require you to attack a different target neither does a multiaction require the actions to do something different. Though this has nothing to do with the target being a mob. This line of reasoning works for all targets.
However this may not be the intention of the rules.
The examples given after multi-attack and multi-action imply that each action has to be distinct. Furthermore allowing multi-attack to be used in this way makes the Salvo Option: 'Spray Shot Vs Mobs' useless. Since in most cases you would kill more troops of the mob by attacking it twice with a Bolt-pistol than shooting at it with a Heavy Stubber Salvo Spray Shot. And you would not even have to spend ammo to do so.
But Multiattacking Mobs is explicitly allowed
Today i found this paragraph on page 203