Adding Abilities

The Trigger Editor allows for the removal of Unit Abilities.. but is there a way to give back the abilities you've taken away?

-Sharsnik

*Bump*

I would also like a naswer to this.

I would like to give units different abilites when they have no inital ones at the begining of a map

To my knowledge, no there isn't. You should try to use the
Player- Enable/Disable ability
action instead.