How do I recode a batch of wrongly coded bills across all our companies?

Accounts → Find & Recode (/accounts/find-recode). 1) Search: date window (three months to today unless changed), organisation, account, type (bill, sales invoice, credit note, manual journal), and More for tracking option and amount range, plus words from the description or contact. 2) Tick the lines to move; the footer totals the net. 3) Recode… (needs invoice-approve) asks for the new account and/or tracking — leave one as it is to keep each line's own — and how: change the documents in Xero, or post a reclassification journal. 4) Confirm. Each line's result lands in the Result column as the run settles. Nothing is written until you confirm.