Saving and loading GameObjects relies on the manager because otherwise it's impossible to resolve references.
To save the children you can simply put all of the children into an array and save this. Something along the lines of:
var children = new List<GameObject>(); foreach(Transform child in transform) children.Add(child.gameObject); ES3.Save<GameObject>("myKey", children);And then to load:
ES3.Load<GameObject>("myKey");
Note that if the children are instantiated at runtime, you will need to follow the "Saving and loading prefab instances" instructions here:
https://docs.moodkie.com/easy-save-3/es ... s-prefabs/
All the best,
Joel