Need help with Units Abilitys and Triggers

[jasonmbrown]

K i was wondering if there was a way to let the user upgrade a units specific stats like how many Creeps the can hit? so that lets say u get the unit and u click an ability button called lets say +1 unit hit. then when he goes to attack the creeps rather than hitting 1 creep he hits 2 or however many times he pressed the button. Im not sure if u would need jass for this or not so i posted it here. Also i know how to put an upgrade button but that basically changes the whole building and i want the same building with more stats Sort of like what the Add damage thing in world editor unlimited does.