Please if there are some experts..I need definition of CMR's (Certification Maintenance Requirements) ??
While I am no expert:
CMR's, like the previous MRB's, are created by the manufacture, operators and regulatory agency establishing the mininum mantenance requirements that all new operator of an aircraft type must follow. This is done prior to the aircraft actually entering service. ie: The 787's CMR have already ben established.
Once an operator has established their ability to maintain the aircraft type, they can and do, with the approval of the manufacture and regulatory agency, modify the CMR or MRB requirements to meet their own needs.