/**
* add a field (column) to this sublist.
*
* @param {string} name field name
* @param {string} type field type
* @param {string} label field label
* @param {string, int} [source] script ID or internal ID for source list used for this select field
* @return {nlobjField}
*
* @method
* @memberOf nlobjSubList
*
* @since 2008.2
*/