Subsidiary
ledger is a Special or supporting ledger (such as cost ledger,
purchases ledger, sales ledger) that provides more detailed information
about individual accounts than a general ledger. Used by firms with
larger number of customers (or creditors), these ledgers divide masses
of financial data into more manageable parts. Total of all individual
accounts in a subsidiary ledger equals the balance of the corresponding
summary account (called control account) in the general ledger.