"Is it possible to write 'end' in the middle of a script, for example, after an 'if' statement?"
Yes.
"Is it possible to use a script to specify 'AddHeroCreatures' and give it the desired army?"
No. He has five paladins, one hundred peasants, and I need to give him one hundred griffins and remove the rest. Moreover, I need to return them afterward.
AddHeroCreatures is a rather obscure command; it simply refused to work, so I had to use AddHeroCreatures.
Sincerely.