serving to assist or supplement; auxiliary; supplementary.

subordinate or secondary

subsidiary issues.

of or pertaining to a subsidiary.

a subsidiary thing or person.

subsidiary company.

Music . a subordinate theme or subject.

adjective

chief , important , necessary

adjective

accessory , adjuvant , aiding , ancillary , appurtenant , assistant , assisting , auxiliary , backup , branch , collateral , contributory , cooperative , lesser , minor , serviceable , subject , subordinate , subservient , supplemental , supplementary , tributory , useful , supportive , affiliate , division , secondary , supplement , tributary

noun

affiliate , branch , division