สอบถามเรื่องการ Select ข้อมูลมาจาก Database เพื่อมา Insert แบบ Multi Record ครับ

<?
include("DB-config.php");

for($i=0;$i<count($_POST["chkUp"]);$i++)
{
if($_POST["chkUp"][$i] != "")
{
$strSQL = "SELECT * FROM tbPO ";
$strSQL .=" WHERE Vendor='".substr($_POST["chkUp"][$i],0,7)."' AND PO='".substr($_POST["chkUp"][$i],7,7)."' AND Line='".substr($_POST["chkUp"][$i],14,2)."' ORDER BY Vendor ASC";

$objQuery = mysql_query($strSQL);
$a=0;
while($rows = mysql_fetch_array($objQuery))
{ 
$a++;
$Vendor = $rows[Vendor];
$Order_Date = $rows[Order_Date];
$PO = $rows[PO];
$Line = $rows[Line];
$Seq = $rows[Seq];
$Item = $rows[Item];
$Description = $rows[Description];
$Qty_Order = $rows[Qty_Order];
$Unit = $rows[Unit];
$Unit_Cost = $rows[Unit_Cost];
$Amount = $rows[Amount];
$Due_Date = $rows[Due_Date];
$Del_No = $rows[Del_No];
$Loc = $rows[Loc];
$InChange = $rows[InChange];
$Firm = $rows[Firm];

?>

  <tr>
    <td height="23" bgcolor="#E9E9E9" class="Body_Black"><div align="left"><input type="hidden" name="hdnVendor<?=$a;?>" size="5" value="<?=$rows["Vendor"];?>"><? if($Vendor<>""){ echo "$Vendor"; }else{ echo "$Vendor1"; };?></div></td>
    <td bgcolor="#E9E9E9" class="Body_Black"><div align="left"><? if($Order_Date<>""){ echo "$Order_Date"; }else{ echo "$Order_Date1"; };?></div></td>
    <td bgcolor="#E9E9E9" class="Body_Black"><div align="left"><input type="hidden" name="hdnPO<?=$a;?>" size="5" value="<?=$rows["PO"];?>"><? echo "$PO";?></div></td>
    <td bgcolor="#E9E9E9" class="Body_Black"><div align="center"><input type="hidden" name="hdnLine<?=$a;?>" size="5" value="<?=$rows["Line"];?>"/><? echo "$Line";?></div></td>
    <td bgcolor="#E9E9E9" class="Body_Black"><div align="center"><input type="hidden" name="hdnSeq<?=$a;?>" size="3" value="<?=$rows["Seq"];?>" /><? echo "$Seq";?></div></td>
    <td height="25" bgcolor="#E9E9E9" class="Body_Black"><div align="left"><input type="hidden" name="hdnPartNo<?=$a;?>" size="10" value="<?=$rows["Item"];?>" /><? echo "$Item";?></div></td>
    <td bgcolor="#E9E9E9" class="Body_Black"><div align="left"><? echo "$Description";?></div></td>
    <td bgcolor="#E9E9E9" class="Body_Black"><div align="center" class="Header_Browse_Body">
      
	  <? if($n=="1"){ echo "$Qty_Order"; }else{?>
      <input type="hidden" name="hdnQty<?=$a;?>" id="txtQty" value="<?=$rows["Qty_Order"];?>" /><input name="txtQty[]" type="text" id="txtQty<?=$a;?>" value="<? echo "$Qty_Order";?>" size="3" onkeyup="alertDataCal()" class="mytextbox"/><? };?>
    </div></td>
    <td bgcolor="#E9E9E9" class="Body_Black"><div align="center"><? echo "$Unit";?></div></td>
    <td bgcolor="#E9E9E9" class="Body_Black"><div align="center"><? if($n=="1"){ echo number_format($Unit_Cost, 2); }else{ ?><input name="txtCost[]" type="text" id="txtCost<?=$a;?>" value="<? echo number_format($Unit_Cost, 2);?>" size="3" onkeyup="alertDataCal()" readonly="true"/><? }; ?>
    </div></td>
    <td bgcolor="#E9E9E9" class="Body_Black"><div align="center"><? if($n=="1"){ echo number_format($Amount, 2); }else{ ?><input type="hidden" name="hdnAmount<?=$a;?>" size="5" value="<?=$rows["Amount"];?>"><input type="text" name="txtAmount[]" id="txtAmount[]" value="<? echo number_format($Amount, 2);?>" size="5" readonly="true" /><? };?></div></td>
    <td bgcolor="#E9E9E9" class="Body_Black"><div align="center"><? echo "$Due_Date";?></div></td>
    <td bgcolor="#E9E9E9" class="Body_Black"><div align="left"><? echo "$Del_No";?></div></td>
    <td bgcolor="#E9E9E9" class="Body_Black"><div align="center" class="Header_Browse_Body">
      <? if($Firm='2'){
	echo "OK";
	}else{
	echo "Not confirm";
	}
	
	?>
    <input type="hidden" name="hdnLineSent" id="hdnLineSent" value="<?=$a;?>"></div>      </td>
  </tr>
  <?php
  
	  }
	  }
      };
	  ?>