Heavenly fields is Buddhist terminology. Therefore it refers to structured layering of the fourth dimensional world. Which is according to each person’s unique frequency. After a successful incarnation an individual will evolve to a higher frequency. Which then determines he will reside in a finner higher level of the heavenly fields.
The Tibetan book of the dead describes the process of dying; with guidance to afterlife. It is stated in the Lord’s prayer. That as it is on earth, so it is in heaven. We all remain the same person in the fourth dimension. With the only difference being in heaven; we do not have a physical body.