How do you make Heros

How do you make Heros

How do you turn a average unit into a hero? For example give a footman level upgrades and hero spells.

Copy a existing a hero (such as the Blood Mage) and set its properties to your custom heroes' desires.

Normal units cannot use hero spells though. Upgrades work for both heroes and normal units.
By the way, this isnt related to modelling.

oops sorry