I'm not sure about what you mean with "Portals", Where can I get some clarifications?
I think the clearing of whole BST are valid. Some time ago I had a male i regression. He said that his theme was Fear, a unusual and brave decision. He came out i a life as a british officer in WW2 figting the Japs on a island. He lead his 200 men ashore and they were all gunned down. Part of him was still hanging in that moment. After he released that part and it had gone to "heaven" He went back and released those of his med that was still on the beach.
Some of my understanding of group release comes from:
Healing the Family Tree by Kenneth McAll (He has written a later book: A Guide to Healing the Family Tree)
Healing Lost Souls: Releasing Unwanted Spirits from Your Body by William J. Baldwin
Remarkable Healings: Psychiatrist Discovers Unsuspected Roots of Mental and Physical Illness by Shakuntala Modi
and of cause Edith Fiore: The Unquiet Dead: A Psychologist Treats Spirit Possession
These have different settings/frameworks they work in, but as Scot Peck (as far as I remember) pointed out: spirit deposession works if you are fudamentalist christian and think of it as demons, It works if you have another faith and think it is discarnate souls, it works if you are of the observation that it is your own former or coming incarnations that are posessing/influencing you.
I think it is our own mindset/fear/conceptions of reality, that limit us. As Robert Monroe discribes in the beginning of "Far Journeys" his concept of reality limited his experience.
kaare