so i got the guide to add ai to my maps, tried it with a biped i downloaded of the internet and it worked fine (came with the actor varient file), then i got another biped but this one didn't come with the actor varient file so how do you make the actor varient file?

thanks in advance

The easiest (and quickest) way, would be to first open a similar actor variant tag. For example if the biped is a custom elite, open the an elite actor variant, if it is like the spartan, you would open the marine or cyborg actor variant. (If you have it)

Next, after you have the actor variant open, change the biped to the one you want to use, and then if you want scroll down and change the equipped weapon to something else.

Hope it helps.

sounds good, i was trying to get a grunt to work, any advice on what tag would be best to use?

If you haven't already, use HEK+ and extract the grunt actor variants from the campaign. Then start with the actor variant that is carrying the weapon that is the most similar to the one you will be using.