Add Skill on Item Purchase

Ok, let me try and explain how I want this to work.

When a Hero purchases a default item (Representing a skill). I want that ability to be added to his available learnable skills when they level up.

I already have the purchasing of the item and the series of actions and conditions leading up to adding the skill but I cannot find an Action that will add it to their learnable skills.

All units start without any skills btw.

This is actually very easy, check this map out

That is how I'd like it to work but I don't quite understand everything that they did via that map.. So I'm not exactly shure if I can use it. I know your pretty much master of all spells but unless someone can explain how to do that without using Copy/Paste I think I will have to go back to the drawing board!

This is how it works: you have 1 ability, let's call it "Base". Each hero has the ability Base in its list of "Hero spells" 4 times. Then you create all of your normal skills that you want to be levelable; finally you create a whole ton of Engineering Upgrade-based spells that transform "Base" into the normal abilities.

So for these upgrade abilities, the the ability changing field would look like this: Data - Ability Upgrade 1 - Base, Shockwave (Shockwave being the normal spell). And the rest of the upgrade slots are blank.

Then, when a hero buys an item, you simply add the appropriate Engineering Upgrade spell to the hero and transform one of the Bases into the bough spell.