Making a senario file from a map file/ AI

[Predator_2]

Hi i am finally actually going after the whole creating u own map and such, but first i wanted to import AI on like an original map or something like bloodgulch, but i dont kno how to edit those maps with the HEK, mainly becasue u need a senario file and they only have those for the tutorial map, not for the originals..i was just wondering if there was a way u could edit the original maps...oh and i was also wondering how to like have AI respawn after they die...i can make them spawn, but after they die they dont come back.