Don’t know much about Oriental Orthodoxy so will not comment.
I’d say that they were both Top down and Bottom up.
They dealt with what was commonly and widely accepted and thus were an organic development of the Church.
They also dealt with some “sticking points” like Hermes and Revelation. In this they would have been acting “top down” by making the determination to include or excude a particular book.
I gathered this listing of councils and declarations that might be of help. I’d be interested in any other councils, synods etc. that might be pertinant.
Bible Canon Councils Approving
From:
catholicapologetics.org/ap031100.htm
Council of Rome (382)
Local church council under the authority of Pope Damasus, (366-384) gave a complete list of canonical books of the OT and NT which is identical with the list later approved by the Council of Trent.
Council of Hippo (393)
Local North African Church council in union with and under the authority of the Bishop of Rome approved a list of OT and NT canon (same as later approved by the Council of Trent)
Council of Carthage (397)
Local North African Church council in union with and under the authority of the Bishop of Rome approved a list of OT and NT canon (same as later approved by the Council of Trent)
Pope Innocent I, Bishop of Rome, 401-417 (405)
Responded to a request by Exuperius, Bishop of Toulouse, with a list of canonical books of Scripture; this list was the same as later approved by the Council of Trent.
Council of Carthage (419)
Local North African Church council in union with and under the authority of the Bishop of Rome approved a list of OT and NT canon (same as later approved by the Council of Trent)
The Council of Nicea (787)
The Council of Nicea II in 787 ratified the same canon as authoritative for the Eastern Churches.
Council of Florence, an ecumenical council (1441)
Complete list of OT and NT canon was drawn up; this list later adopted by the Fathers of the Council of Trent
Peace
James