Member Details: Custom Fields
You can create up to 50 custom fields, and use them for whatever data you need. A custom field can be defined as a basic entry field, a dropdown list of choices you determine, a checkbox, and more. They can be defined to store numbers, currency, text, and dates.
Note: A similar page is available on Group records to display custom field data for a specific Group. Custom field definitions are created separately for membership records and Group records.