Apart from the default fields, you can also import additional fields from the Active Directory. Please follow the below steps to import additional fields.
1.) You may need to first add additional fields under Admin->Users Additional-Fields ->Requester Additional-Fields.
2.) The configured requester additional fields – Text, Numeric and Date/Time fields will appear in the “Import from Active Directory” window under Admin->Active directory under the section “Select UDF for import”
3.) Enable the check box beside the additional field and specify the exact attribute name for the respective field in Active Directory in the text box and do an import.