INSERT INTO Prospects ( old_ID, donor_type, prefix, first_name, last_name, re_address1, re_address2, re_city, re_prov_state, re_nation, re_postal_zip, bu_company )
SELECT Sheet1.old_ID, Sheet1.donor_type, Sheet1.prefix, Sheet1.first_name, Sheet1.last_name, Sheet1.re_address1, Sheet1.re_address2...