Change management operations are organised using change request sessions.
Note: Make sure you test this process in a DEV environment first, and you are confident with Configuration Manager usage, before bootstraping LIVE or QA environments.
open --source <source_name>--target <target_name>. This creates a new change request with the changerequest.yml file in a new folder.
A change request will contain the list of changes (e.g. add, delete, update) used in a session and ready to use in a commit.