Merging ledger and legal entities with one existing

Hi, in our company we work with EBS 12.1.1. We have various modules (FA, AR, AP, GL, PO, PA, OIC, AD) and our setup includes a number of different legal entities and different ledger.

Next year we plan to merge one of these ledger with another existing ones, and I was wondering if there is a document describing, step by step, things to do (for each module) to closing correctly this project . Would need a sort of checklist for each module, the list of data to be migrated (open transactions, receipt, assets, etc.) and the checklist for the new setup (i.e. documents, categories, sequences) to set.