Vexorian spell system- disabling damage to structures?

One of the big things that I really need to do is to stop spells using these systems from harming structures. One of the main elements of balance in the map I've been working away at is that only ultimates can damage defensive structures (apart from normal attacks)-- and because many of the spells I've been putting together using Lord Vexorian's framework deal so much damage, their being able to also deal said damage to these structures is most troublesome-- it essentially makes the heroes with vexorian spells -far- more potent at demolitions then those without. Is there a line I can add or adjust to deny structures as a valid target for the damage of these spells? I can set the actual ability that they are triggered from to be unable to target structures of course, but the area damage, etc. always hits them anyways.

That is difficult, none of my functions have an extra argument for that, and changing that in the spells will be surelly worse, you'll definitivally need to learn JASS and change them manually.

Nowadays, could you tell me which spells do you want to change

Well, currently this applies to Charge and the Beam and Nova templates. As said, I made them unable to target a building, but if the player, say, targets behind the building, the path of the spell will damage the building, or the area of effect damage will.