Triggers, Events & Spawning

[tiggermcse]

I've been messing around for awhile creating single missions. But I am not able to figure out how to spawn ships or groups using triggers and events. I'd like to have a group be spawned nearby when a specific ship is sunk but nothing seems to work.

Also, same type thing with how to spawn a randomly generated group.

Or is this only possible when working with a campaign?

Thanks to any who can teach me what I'm doing.....