How do I make 1 spell open up a menu of other spells?

How do I make 1 spell open up a menu of other spells?

Hi,

In some games I've seen, when they run out of space for abilities in the bottom right area, they make 1 ability which when clicked, clears away all of the buttons in the bottom right, like attack, hold position, patrol, and shows like 3 or 4 spells in their place, and lastly has a cancel button to go back. I'm not sure if stacking spells is the right term for this, but I want to know how to do it so I can create units with more than a few abilities. Could someone tell me how they did this?

Thanks,
Alex

Gives 'Spell Book' ability on that unit. 'Spell Book' ability is ability that comes from spell book item.

i asked that before.... heh heh