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How would you set a default value of a sublist line? I would want Packaged ID of that new line to default to 03

Please try the below code snippet by replacing the field Id and the sublist Id 

function validateLine(scriptContext) {

  var currentRecord = scriptContext.currentRecord;

var currIndex = currentRecord.getCurrentSublistIndex({
    sublistId: ‘sublistID’
});

  var lineNum = currentRecord.selectLine({
    sublistId: 'sublistID',
    line: currIndex
  });

  currentRecord.setCurrentSublistValue({
    sublistId: 'sublistID',
    fieldId: 'fieldId',
    value: currIndex + 1,
    ignoreFieldChange: true
  });
        
  currentRecord.commitLine({
    sublistId: 'sublistID'
  });
}

This is a client script and will trigger as soon as you click on the line