StarGate wrote: The way how i do it is I declare, Im fireing a hvy weapon at a said squads, i roll to hit and wound., then i declare im fireing assualt. combi weapons at the said squad.,( since hvy and assault weapons usually mean dead models...) then i declare bolter fire.
Or i Just declare what dice are what weapons Large one is Hvy, the blue one are assalt/combi, and white are bolters and roll them all at one time.
This is actually not legal, you must declare all shooting before rolling any dice, infact, you have to declare what weapons are firing before you even check range, as can be seen on page 16 of the core rulebook, so if that tank *looks* like it's 12" away, you might have to think hard before declaring those combi-melta shots and finding out you are out of range.
Regarding wound allocation, there has been much made of this, but the rulebook is pretty clear
IMO, models that are "Identical in gaming terms" are defined as those that "have the same profile of characteristics, the same special rules and the same weapons and wargear", and these identical models take saving throws as a group.
While a Combi weapon may no longer function as anything other than a bolter, there's nothing in it's rules which say it ceases to be a combi-weapon, or becomes anything else.
So the act of firing off a Combi weapon is insufficient to distinguish one member of a squad from another with an unfired Combi weapon, you would roll thier armour saves together, and assuming you failed any, would presumably remove the spent combi weapons before the unspent ones.