Yeah you can basically write one up then copy and paste it into the others, just changing the spell names where necessary; basically comes down to

/assist Name/Focus/whatever you use
/cast SpellNameHereWithProper:Capitalization (Rank # being optional and in parenthesis like this; if Rank is not used, it defaults to max rank of spell)

/assist Eteocles
/cast Moonfire

Copy/paste/rename:
/assist Eteocles
/cast Teleport: Moonglade

etc; can keep a master copy in notepad to edit and copy/paste from since you can paste into wow