Question about using brand new spells..

Are they only user spells, or will AI controlled units be able to know to cast those spells..
Also is it possible to make a unit cast these spells via a trigger? Like you know how they have trigger "Make, Unit use Shockwave skill and point of player 1 hero"
I am curious about these cause I want to give some of my big bosses some crazy spells.

The AI itself will use those spells like they would use the base spells.
You can order a unit to cast spells with the Unit - Issue Order ... actions.

"You can order a unit to cast spells with the Unit - Issue Order ... "

Yes, but you always manually have to pick the spell... Like, Blizzard and such, new spells you would add wouldn't have command triggers for them in actions.

You choose the base spell. It will work for your new spell too.

But how does one exactly check what the spells was originally based off of? Just going to the custom ability and clicking "reset to default value" or is there another way?