Holding company Brand Guideline for New Identity ( Business elements )

We need to create full business elements to a Holding company Brand Guideline we have just created, we create the designs but we still need:
Introduction ( cover letter of the identity book),
add brand strategy
( what is branding in general, Frame of Reference, core purpose (is an organization’s fundamental reason for existing beyond just making money), brand vision and mission, Personality, brand promise) +
Brand portfolio structure:
Branded House Strategy "Master Brand / Monolithic "
Sub-brand Strategy
Endorsed Strategy
House of Brands Strategy "Autonomous"