The Manufacturer's (Boeing) Maintenance Review Board (MRB) produces the Maintenance Planning Document (MPD) that becomes the minimum maintenance requirement any Operator must do to it's aircraft. (this is 'owned' by the Operator not the Maintenance Organisation)
The Operator adopts and adjusts the MPD to their own requirements based on the amount and type of flying planned plus any other checks the Operator wants to conduct - the operator may not do less than the MPD. This is approved by the National Airworthiness Authority, and becomes the Operator's Maintenance Programme (OMP) - often called the Aircraft Maintenance Programme (AMP)
Hope this helps
Rigga