From poshyb:
There are two main spawn types in most missions. One is used for ambush, boss, patrol or destroy object details, the other is used for battle, rescue, escort, ally, or defend object details. (Some maps have additional spawn types that are not overrideable by the MA).
Lets pretend you picked a map with 15 of the first type and 15 of the second type. If you wanted it to be empty until your trap is hatched, you could add a patrol detail with quantity 15 and and a battle detail with quantity 15. Next, add a collection detail and have both the patrol and battle trigger on completion of the collection.
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I thought there was an option for that in the interface now. Can't you choose "none" as the enemy type or something? I'll have to look when I get home.
Avatar: "Cheeky Jack O Lantern" by dimarie
Hey, I'm working on a mish, and i need to know how to make it so there are no enemies on the map. Is there any way to do this? thanks