"Script it yourself" Very helpful post.
force master:
I attached the script.
Do the following:
1. Place an enemy.
2. Right click on this enemy, give him a unique name for example 'Enemy1' and set the option 'Spawn at start' to NO.
3. Use the Window large segment from Sci-fi segments.
4. Right click on this window and replace the Destroy script with the script I attached to this post, and in the 'If used' field, type the name of the enemy: 'Enemy1'.
To spawn several enemy at the same time, you only need to give them the same name.
May the Force be with you Master Obi-Wan.