how to pass data I selected in the datatable for insertion

Question

What I want to do is, I have fetched data tables using JQUERY, Ajax, PHP after that selected multiple check box in the table, those selected rows of data I want to store in new database table on submit button

I don't know how to do it, I googled but there is I Don't find any such solution for this.

HTML code here

<label for="fname">insert number for select multiple check box</label>
        <input type="number" id="selectcheckbox" name="selectcheckbox">
    <table class="table table-striped table-bordered" id="tbl">
        <thead>
            <tr>
            <th>SELECT check-box</th>
            <th>QUALITY REPORT NO</th>
            <th>UID NO </th>
            <th>ITEM CODE </th>
            <th>DESCRIPTION</th>
            <th>H.NO </th>
            <th>Qty</th>
            <th>SELECTED  QTY </th>
            <th>NOTE</th>
            <th>LOCATION</th>
            <th>SELECTED  QTY hidden</th>
            <th>NOTE hidden</th>
            <th>LOCATION hidden</th>
            </tr>
        </thead>
        <tbody>
        </tbody>
    </table>
    <button type="button" class="btn btn-primary" name="submitdata" id="submitdata">submit data</button>

java-script here

<script>
$(document).ready(
    function()
        {
            var table = $('#tbl').DataTable({
                "columnDefs": 
                [{
                    orderable: false,
                    className: 'select-checkbox',
                    targets:   0
                }],
                destroy:true,
                "fnRowCallback" : 
                function(nRow, aData, iDisplayIndex)
                {
                    $("td:first", nRow).html(iDisplayIndex +1);
                    return nRow;
                },      
                'select': 
                {
                    style: 'multi',
                    selector:'td:nth-child(1)'
                },
                    'order': [[ 1, 'asc' ]],
            });
          
              $.ajax({
              type:"POST", 
              url:"fetch_data.php",  
              data:'item_code_no='+item_code_no,
                success: function(data)
                {
                  if(data['error'] == '0')
                  {
                    console.log(data);
                      
                      //set Finish Data
                      table.clear().draw();
                      for(i = 0; i < data['chemical_date'].length; i++) 
                      {
                        table.row.add([
                        data['chemical_date'][i]['mqr_id'],
                        data['chemical_date'][i]['mqr_id'],
                        data['chemical_date'][i]['uid'],
                        data['chemical_date'][i]['item_code'],
                        data['chemical_date'][i]['description'],
                        data['chemical_date'][i]['h_no'],
                        data['chemical_date'][i]['qty'],
                    
                        "<input type='text' value='' class='form-control' id='selectedqty"+i+"' onkeyup='sqty(this.id);' name='selectedqty"+i+"'/>",
                        "<input type='text' value='' class='form-control ' id='note"+i+"'  name='note"+i+"' />",
                        "<input type='text' value='' class='form-control ' id='location"+i+"'  name='location"+i+"' />",
                        '',
                        '',
                        ''
                        ]).draw(false);
                      }
                  }
                }
              })
        });
</script>
<script>
 // select check box script
    $("#selectcheckbox").on("change", function(){
        //remove selected class
        $("#example tr").removeClass("selected")
        for (let i = 0; i < $(this).val(); i++) 
        {
          //check if td there ...
          if ($("#tbl td.select-checkbox:eq(" + i + ")").length > 0) 
          {
            //add selected class..
            $("#tbl td.select-checkbox:eq(" + i + ")").closest("tr").addClass("selected") //try with `.click()` as well..
          }
        }
    })
</script>

below code is fetched data from Database using PHP

fetch_data.php

<?php
header('Content-Type: application/json');
    $response = array();
    $response = array();
    if($_SERVER['REQUEST_METHOD']=='POST')
    {
        extract($_POST);
        //Top data
            $data = array();
            $obj = array(); 
            $sql = "SELECT DISTINCT mqr.sr_no as mqr_id,mi.item_code,mqrpd.uid,mqrpd.qty,mqrpd.h_no,mqrpd.htc_no,md.description 
                    FROM table1 mqr,table2 mqrpd,table3 mi,table4 md
                    WHERE mqr.item_id_fk=$item_code_no and mqr.id=mqrpd.quality_report_id_fk and mqr.item_id_fk=mi.id and mi.drawing_id_fk=md.id";

                $result = mysqli_query($db, $sql);
                $chemical = array();
            
                while($row = mysqli_fetch_assoc($result)) 
                {
                    //Finish Data
                    $row1 = array();
                    $row1['mqr_id'] = $row['mqr_id'];
                    $row1['item_code'] = $row['item_code'];
                    $row1['uid'] = $row['uid'];
                    $row1['qty'] = $row['qty'];
                    $row1['h_no'] = $row['h_no'];
                    $row1['htc_no'] = $row['htc_no'];
                    $row1['description'] = $row['description'];
                    array_push($chemical, $row1);
                    //Stock Data
                }
                $response['chemical_date'] = $chemical;
                //Process Data
                $response['error'] = "0";
    }
    else
        $response['error'] = "1";
        echo json_encode($response);
?>