The only way that I know how to do this is to make an ability based off of the "tiny buildings" ability, (ex: tiny barracks), and to make it a unit ability, then change the buildings in the ability to the one you want and edit the casting range to the max. I don't know how helpfull this would be...
English Fixed:
Umm... is your map protected? It says level info data missing or invalid. So either there is a problem with your map more tha you know, or you protected it.
Its been awhile, but in the "targets allowed" under the spell options in the object editor, i think its called, only select undead. Then it wont even let you target anything other than undead.
What EXACTLY do you need? Do you need sounds? Do you need to know how to import them? Do you need to know how to trigger them to play? Do you need to know how to get the in game ones to work?
Pwned List is a site that you can join for free, where you can get Pwnage Points for doing certian things on Halo 2 on XBL. Such as noted HERE. Then you can see how you stack up against other members on the top 10. But be careful not to get "Pwned" by another member or you will lose a point...