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<@U4XT29MRD> <@U2PHMMX2Q> 
Might be interested, here is mysolution to deleting all items following the 4-5 hierachy (see thread)

var col = new nlobjSearchColumn('internalid', null, null);
col.setSort(true);

rec = customSearchRecord('noninventoryitem', null, [col]);

for (var i=0; rec.length; i++) {
console.log(i + ' / ' + rec.length);
nlapiDeleteRecord('noninventoryitem', rec[i].getId());
}

customSearchRecord is equivalent to nlapiSearchRecord but for more than 1000 records