How to add 'save' functionality for an already saved game?

Hi, I am trying to edit the collab viewer template to enable the player to be able to save his game on top of an already saved one. The template only allows to save changes to a new state every time.

Going through the blueprints Im not sure if it is wiser to update the arrays on the SaveGame BP or put in a condition after every save of a transform, that checks if that state already exists.

Do you know if this is at all possible in any way?