spawn different missiles

[theoutlaw]

Hi , i'm starting to feel comfortable with missile editing.
However there is one thing I couldn'T find : how to have a skill / missile spawn 2-3 different missiles.

The only clue I could find is this sentence in the missile file guide from someone post :
' cltDoFunc 67, (or 68 I can't remember, see the one that does not appear in txt) spawn 3 submissiles according to the direction increments in params 1(global),2,3,4(submissile specific); '

Does anyone know how to spawn different missiles from a skill / missile ?
( For exemple , a nova like skill that spawns fire and cold bolts. )
Thank you !

edit :: its ok for the nova actually , i just have to mix 2x 1 frame FO with 2 different type of nova.
However the base question is still : how can I spawn 2 or more different missile from 1 skill / missile ?