Either import data into custom record types that you have already created, or create custom record types during the import process. Using the Import Data Wizard to create a custom record type is recommended only if:
When to Create the Custom Record Type Yourself
More information: How Status and Status Reason Attributes Are Imported, Data Map Schema Reference.
Suggested Modifications After the Wizard Creates a New Record Type
The Import Data Wizard only adds new record types and new fields. It does not customize the form or views for the record type. When import is complete, review the customized record type in the Customization area to make the following changes to the new record type, at a minimum:
For information about how to customize fields, forms, and views:
In the Customization area, click Help, and then click Help on This Page.