@vilaspadole If you are adding multiple, use an array of filters and addFilters: var newSearch = nlapiLoadSearch('opportunity', 'customsearch_kr'); // Define additional filters to the existing search var newFilters = new Array(); newFilters[0] = new nlobjSearchFilter('somefilter'); newFilters[1] = new nlobjSearchFilter('somefilter1'); newFilters[2] = new nlobjSearchFilter('somefilter2'); // Call addFilters to add filters to the existing search newSearch.addFilters(newFilters);