In the event sheet editor you can use the System object action Create Object to spawn a second instance of whatever you would like.
You can even configure it with unique values if you add the settings right after the action that makes it (eg:
-Create "Sprite" on layer "Objects" at 0, 0
-Sprite: Set color filter to Red
-Sprite: Set private variable "Life" to 100
But, if you want to create multiple sprites at once, you need to do it like this:
-Create "Sprite" on layer "Objects" at 0, 0
-Sprite: Set color filter to Red
-Sprite: Set private variable "Life" to 100
-Create "Sprite" on layer "Objects" at 0, 0
-Sprite: Set color filter to Red
-Sprite: Set private variable "Life" to 100
as any settings after the "Create" action will apply only to the newest sprite you made.