Custom fields let you extend contacts, deals, and companies with the data your business actually tracks - an account number, a region, a renewal date, a tier. Navigate to CRM > Custom Fields (admin only) to define them.
Each field has a name, a target record type (contacts, deals, or companies), and a type: text, number, dropdown (with the choices you supply), checkbox, or date. Once saved, the field appears automatically on that record type's new and edit forms - no further setup.
Beyond the forms, custom fields work like built-in ones across CRM: they're available as filters on list pages, they appear as mapping targets when importing contacts from CSV (look for the "Custom:" options - see Importing Contacts from CSV), automation rules can use them in conditions (see CRM Automations), and the REST API reads and writes them (see The REST API and API Keys).
Renaming a field or adjusting a dropdown's choices takes effect everywhere the field appears. Removing a field removes it from forms and filters - do it deliberately, since values already stored against records stop being visible once the field definition is gone.
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