Tishanna asked: “Am I understanding correctly that the "part" of us that perceives itself to be experiencing PMR is a "splitting off" of the oversoul?“
Yes, we (in PMR) represent only a fragment of our total self. However, we must be careful how using PMR words leads us into assumptions. Because we are habituated to 3D spatial concepts our use of the word “fragment“ implies two or more separate pieces splitting off into different places. In consciousness space there are no places, much less different places — that is a 3D concept that doesn't apply to consciousness or to NPMR. When our NPMR friends communicate to us we have no choice but interpret their message in terms of our PMR experience (vocabulary, concepts, knowledge, beliefs, culture). We get something that forces their meaning to be expressed in terms of our experience. The general content of the messages are typically conveyed accurately enough but don't take the details of the expression, e.g., specific words, to literally. When your guide says "Life is but a dream" interpret it as poetry rather than literal facts expressed in PMR 3D words. For example: "Life is but a dream" means life is nonphysical, all realities are nothing more than the product of consciousness or thought, just as dreams are.
One could also say that we are a “projection“ of our oversoul or one “specific instance“ of our oversoul, or that our life is a specific dream of our oversoul. These statements would be correct as well. That same 3D habituation gives us a tendency to think in terms of: if we are over here, then the rest of the oversoul must be over there — because it is a fundamental belief of our culture that all beings and all objects must be separate (no two things can occupy the same space). This leads us to mentally put the oversoul that is “over there“ into a chamber (3D spatial concept) where it is waiting for us to return. We and our oversoul are one. One consciousness with several simultaneous trains of thought. Each train may be undergoing different experiences in different virtual realities. Like playing two complex role-playing video games at the same time while waiting for your mother to fix dinner (that would require two computers and three trains of thought operating in three different reality frames). Note that none of the three are required to go lie down in a chamber or be Ã¢â‚¬Å¡Ãƒâ€žÃƒÂ²housed“ somewhere else and that all three realities are taking place simultaneously. Also, even though the lessons learned in each (such as: you do better if you work cooperatively) may flow over into the other two, all three realities maintain their separate integrity. The whole benefits from the cumulative contributions of each set of experiences (lessons learned) in each reality. Some realities may be more productive than others.
I know that this is very difficult to think about but I hope my comments help you out more than they confuse you. We often confuse ourselves by applying the implicit 3D assumptions carried by PMR words to our description of NPMR or consciousness or soul. Such conceptual errors are hard to avoid and more common than dirt — they are an occupational hazard of dreaming that you and you body are living together in some nice little virtual physical reality somewhere in the suburbs of NPMRville.