Upgrade Help

Hi! Is it possible to add an upgrade to a building much like adding an ability?
And by that i don't mean changing the level of an upgrade, i mean actually ADDING a NEW upgrade option to a building so that i can research it at a later time. This upgrade can't be a dummy upgrade either.

The problem is that i can't find an action that says "unit - add upgrade option" etc.

Please help!!

Try giving the unit the upgrade, and then, at map initialization, use the trigger action "player - set max upgrade level" to set it to 0, and then, at a later time, set it to 1 to make it avaliable.

Thanks, i never thought of that! That's just what i needed!