Impaling bolt?

Is there any way to give another unit with a ranged attack the abilty Impaling bolt? I've tried creating a custom unit from an archer, and giving it the ability Impaling bolt in both the abilities and Upgrades used fields (what does "Upgrades Used" actually do?), but it still doesn't work.

Are you checking to make sure it doesn't work by looking at the graphic or by looking at the unit's health? Because it could be that it works but it just doesn't look like the arrow is going through the unit cuz the skill was designed for ballista bolts.

No, it doesnt work at all. I tested it by placing an "army" of enemy peons and testing both the custom unit and a standard ballista. The custom unit only injured 1 peon at a time, while the ballista worked as it should.

are the weapons type and damage tpe right? dose the unit use splash damage?

I believe that splash damage can only be done by units with hard coded 'splash damage' effects, no matter what you try to get them to do. Try using the Ballista model as the base for the custom, and swapping in a different model afterwards. I had the same problem getting my units to do splash, and that fixed it (used the mortar team base model, and changed it to the one i wanted).

are u using artillery(line) weapon type?