Q:

Insert values in the last row of a determined column with app script

I need to copy the values ​​in the last row of a certain column, I was seeing examples like this... Stackoverflow  but they have not served me with my script. The problem I have is that in the column A I have five values and in the column B and C I have only one like this ...
A  B  C
1  1  1
1  -  -
1  -  -
1  -  -
1  -  -
and I want to insert values ​​in the column B andC like this...
A  B  C
1  1  1
1  2  2
1  2  2
1  -  -
1  -  -
but the problem with my script is that it inserts them like this...
A  B  C
1  1  1
1  -  -
1  -  -
1  -  -
1  -  -
-  2  2 
    //This part its not important
    function last(){
    var ss = SpreadsheetApp.openById("ID");
    var ssh = ss.getSheetByName("Name")
    var Range = ssh.getRange("B1:C"); 
    var getVal   = Range.getValues();

    //This part its the important
    var ss = SpreadsheetApp.getActiveSpreadsheet();     
    var ssh = ss.getSheetByName("Sheet 1");
    var lastRow = ssh.getLastRow() + 1;
    var ssRange = ssh.getRange(lastRow , 2, getVal.length, getVal[0].length).setValues(getVal);
}  

I need help so that the values ​​are inserted in the correct row.
EDIT 
This is the script that I have...
 function last(){
  var ss = SpreadsheetApp.openById("ID");
  var name = ss.getSheetByName("NAMES");
  var lastRow = name.getLastRow();
  var range = name.getRange("A"+(lastRow)+":D"+(lastRow)); 
  var datas   = range.getValues();

  var actSs = SpreadsheetApp.getActiveSpreadsheet();     
  var sheetOne = actSs.getSheetByName("1");
  var ltRo = sheetOne.getLastRow();
  var startRow = null;
  var i = 0;
  while(i < datas.length)
 {
  if(datas[i][0]){
  startRow = i + 2;
  i++;
  }
  if (!i){
  startRow = 1;
  }
  var ssRange = sheetOne.getRange(startRow, 2, datas.length, 
   datas[0].length).setValues(datas);
  }
 }  

and this is the Spreadsheet

A:

Another method I have used previously from this answer:  
var ss = SpreadsheetApp.getActiveSpreadsheet();     
var ssh = ss.getSheetByName("Sheet 1");
    var Avals = ssh.getRange("B1:B").getValues();
    var Alast = Avals.filter(String).length;
    var ssRange = ssh.getRange(Alast +1 , 2, getVal.length, getVal[0].length).setValues(getVal);

