"Maximum number of targets" What does this field do?

Ok i have searched and the only thing i found out was that it only work Missile or Missile(Bounce) cant really remember wich one it was.

I have tryed it out in the editor and i cant really get it to work, what does this field really do? And what should i do to make it work? I know i could use barrage but i want my unit to only hit 2 units.

On what? A unit (does it even exist there?)? A spell? An item?

Or are you talking about Huntresses bouncing glaives? Because the actual ability does nothing; the entire process is done through upgrades.

Oh dident know their existed so many fields with that name. Its for a unit(Combat - Attack 1 - Maximum Number of Targets), i want it to be able to attack 2 units at the same time. But what number or weapon type i choose he cant attack 2 units at the same time.

So if i would like to have my unit attack 2 units i would have to do it true an upgrade? Fine with me.

An OT question, but what does Missile (Line), Missile (Splash), Missile (Bounce) and Missile (Artillery) do? The only one im 50% sure about is that (Splash) gives you that red icon to use. Are (Line) and (Bounce) needed for the night elf upgrades to work?

Maximum number of targets is for the Missile (Bounce) attack and marks the maximum number of targets hit with the attack.

If you want to attack multiple enemies at the same time, you need to use the Barrage ability.

Missile (Bounce) hits the target and then bounces to other enemy targets.
Missile (Splash) hits the target and does damage in a circular area with the target at the center. I am not sure if this damage affects friendly units.
Missile (Line) hits the target and then continues on for a certain distance in a line behind it, doing additional damage. (Think shockwave starting at the target.) The ballista unit of the Night Elves does this type of damage and is easy to picture in your mind. Another thread said this damage affects friendly units but I do not know myself.
Missile (Artillery) - I do not remember this one existing but in any case I do not know what it does.

Hope that helps!