相关的下拉列表，而不是列

Question

我正在使用生成下拉列表的脚本。问题是它总是在右边的列中生成下一个列表。我想将其更改为每个选项，在下面的行中生成下一个依赖的下拉列表....

这是我正在使用的脚本

function depDrop_(range, sourceRange){
var rule = SpreadsheetApp.newDataValidation().requireValueInRange(sourceRange,true).build();
range.setDataValidation(rule);
}
function onEdit (){
var aCell = SpreadsheetApp.getActiveSheet().getActiveCell();
var aColumn = aCell.getColumn();
if (aColumn == 1 && SpreadsheetApp.getActiveSheet()){
var range = SpreadsheetApp.getActiveSheet().getRange(aCell.getRow(), aColumn + 1);
var sourceRange = SpreadsheetApp.getActiveSpreadsheet().getRangeByName(aCell.getValue());
depDrop_(range, sourceRange);
}
else if (aColumn == 2 && SpreadsheetApp.getActiveSheet()){
var range = SpreadsheetApp.getActiveSheet().getRange(aCell.getRow(), aColumn + 1);
var sourceRange = SpreadsheetApp.getActiveSpreadsheet().getRangeByName(aCell.getValue());
depDrop_(range, sourceRange);
}
else if (aColumn == 3 && SpreadsheetApp.getActiveSheet()){
var range = SpreadsheetApp.getActiveSheet().getRange(aCell.getRow(), aColumn + 1);
var sourceRange = SpreadsheetApp.getActiveSpreadsheet().getRangeByName(aCell.getValue());
depDrop_(range, sourceRange);
}
}