If you're editing in the ability GUI then you make two strings, ie. "attack, 2"
If you're making the spell using triggers use "Animation - Play (Triggering unit)'s spell 2 animation"
Actually I currently have a problem where im using triggers to create a ability and I want the unit to do 'spell' animation but if I leave it as 'spell' then it will randomly do the 'spell' or 'spell 2 ' animation. When I just want it to do the 'spell' animation.
Oh I tried 'spell 1' and 'spell - 1' and neither worked :/
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.