Hi! I downloaded a character model from Sketchfab. The problem is that it has 3 versions of the same character in the same file. I only need one. When I try to select and delete them Unity says that the childs can´t be reordered or removed. Can somebody tell me how to remove them or at least make invisible the other 2 please?. Thanks. Kind regards 
You have to unpack the prefab, you need to right click and select that from the menu.