Cant' Edit PreFab's script variables

Hello!
I have an "Enemy" into my scenes. Attached to this enemy I have a script with an array of transforms. My intention is to store some "points" where this enemy should stay near. I am picking index [x] from another script. So i have those 10 elements in my array.


My problem is ... when I drag and drop my Enemy into a PREFAB folder ... (
in addition to having to fight with that "Cyclic nesting detected" error) I have that array cleared!


And I can't drag & drop positions as .... in the hierarchy i have to "Close" my PreFab in order to get back to my Objects ...



So .. How can I re-populate that array in the pre-fab enemy?

Thanks!