In NetSuite, when setting up custom fields, the "Normal" display type should be selected if the field is meant to be editable. This setting allows users to interact with and edit the information contained in the field during record entry and editing processes. The "Normal" display type is contrasted with other types such as
"Disabled" (which prevents user interaction) and "Inline Text" (which displays the field as read-only text).
Choosing "Normal" ensures that the field behaves like a typical input field within NetSuite's forms.
References:
NetSuite Customization Guide on "Custom Field Management."
Best practices for setting up custom fields in NetSuite.