Manual double-entry bookkeeping inside ClientManager, for adjustments and corrections that don't come from an Invoice or Bill.
Side menu → Financials → Chart of Accounts → New Account. Give it a Description, Account Number, and Type, and optionally nest it under a Parent Account for a simple one-level hierarchy.
Side menu → Financials → Journal Entries → New Journal Entry. Set the Transaction Date, an optional Reference Number, and whether it's an Adjustment Entry, then save — the entry needs to exist before you can add its debit/credit lines.
Add Line for each account affected, entering either a Debit or a Credit (never both on the same line) plus a Memo. The panel keeps a running Total Debits / Total Credits and tells you whether the entry is balanced.