var locationId = nlapiGetFieldValue("location");
var locationRec = nlapiLoadRecord("location", locationId);
var subrecord = nlapiCreateSubrecord("shippingaddress");
subrecord.setFieldValue("country", locationRec.getFieldValue("country"));
subrecord.setFieldValue("isresidential", "F");
subrecord.setFieldValue("attention", locationRec.getFieldValue("attention"));
subrecord.setFieldValue("addressee", locationRec.getFieldValue("addressee"));
subrecord.setFieldValue("addr1", locationRec.getFieldValue("addr1"));
subrecord.setFieldValue("addr2", locationRec.getFieldValue("addr2"));
subrecord.setFieldValue("city", locationRec.getFieldValue("city"));
subrecord.setFieldValue("state", locationRec.getFieldValue("state"));
subrecord.setFieldValue("zip", locationRec.getFieldValue("zip"));
subrecord.commit();