Updating Suitelet Sublist Fields by client-side script

Hi,

I am trying to update a Suitelet sublist fields using a button and client-side script. Is this possible? My script simply clears the field. Does the sublist have to be of a certain type e.g. inlineeditor?

The idea...
Create a select field with a source to a custom record and a button that when pressed it will up take the value of the select field and update a column (every row) on my sublist to that value.

What I have so far...

 function suitlet(objRequest,objResponse){  var objForm = nlapiCreateForm('Migrate Sales Order Lines'); // Create Form  objForm.setScript('customscript_contract_migration_so_cs'); //same script file    // add Sublists  var slSO = objForm.addSubList('sl_trans', 'list', 'Sales Order Lines');  slSO.addField('custpage_checkbox', 'checkbox','Select');    slSO.addField('custpage_id', 'text', 'ID')  slSO.addField('custpage_num', 'text', 'Number')  slSO.addField('custpage_so', 'text', 'Sales Order');    slSO.addField('custpage_customer', 'text', 'Customer');  slSO.addField('custpage_amount', 'currency', 'Amount');  slSO.addField('custpage_startdate', 'text', 'Start Date');  slSO.addField('custpage_bo', 'text', 'Billing Option');  slSO.addField('custpage_bo_new', 'select', 'Migration Billing Option','customrecord_billing_options'); // <-- this is the field I want to update via button and field selection    //SEARCH blah blah (skipped to avoid boredom)    for(var i=0;i<arrTransResults.length;i++){       slSO.setLineItemValue('custpage_radio', i+1, stSelectRadio);  slSO.setLineItemValue('custpage_id', i+1, arrTransResults[i].getId());  slSO.setLineItemValue('custpage_num', i+1, arrTransResults[i].getValue('number'));  slSO.setLineItemValue('custpage_so', i+1, 'Sales Order #' + arrTransResults[i].getValue('number'));  slSO.setLineItemValue('custpage_line',