Custom Dummy spells

Custom Dummy spells

Ok, this probably gets asked alot, but when i got to trigger a spell of mine, i give the action: Unit-Order unit. But when i pull down the spells menu, it only gives me a few certain default spells. How can i make my dummy cast a custom spell rather than a default one?

all the spells are based off something. like you can build a high-rise building, or a mansion, but whats bottom is still concrete. so, if you based your spell off War Stomp, for example, but renamed it Soil Erosion, or something, it's still a War Stomp, thus when you give an order, order it to cast Tauren Chieften -> War Stomp, etc.