How do you import custom spells?

How do you import custom spells?

I'm trying to figure out how to use custom spells you have downloaded in your own maps.

I've imported the file with the importer...but I can't figure out where to go from there (if thats the way I should be going)

copy the trigger, maybe u have to create variables (they should have the same names like in the orignal spellmaps), sometimes u have to create new dummy units/abilities

You also have to copy the ability with the triggers (and/or variables)