Second build menu?

[Drenith]

I was wondering on the easiest way to implement a second build menu... unit needs to be able to build an extra 8 structures. Also i need the buildings to be built in the normal fashion, so no summoning building for humans, orcs, or night elf...

 

[Saia_Djinn]

use spellbook and then trigger it via spell like and dummies

easiest way is :

add another spell to that unit
if unit use that spell
remove 1st build menu and add 2nd and vice versa