There is no substance in the sense of a selfsame something that endures and experiences for more than a fraction of a second. All of them are rapidly developing minds. There is no place to be except in an experience. As 3B will make clearer, God has to be in every experience in order for it to exist, but it could not exist at all if there were only God in it. It is God that is metamorphosing in what this view considers creation.
Creation is the shaping of formless divine substance into formed substance.
God, may be more appropriate in this context. Healing is the revelation of what already is present but hidden. Each act of creation is new and unique, not a reshaping of what has been in existence, although the past is essential to the new creation. Creation is the new experience's selecting from among the influences of past acts of creation and the divinely offered possibilities for the new creation. A. God is partly Law and is impersonal.