Appended new row is not behaving like previous one (row)

There are several issues with your code

The two most important are

You use multiple elements with the same id. But ids must be unique. JavaScript/jQuery will always use the first element with the id if multiple elements have the same (CSS is different). I used name instead of id here
You add event listeners to elements, which are not there at run-time. Only the first input-row is created, when you listen to the focusout events. I listen to the focusout event on the whole document. If you focus out of an input, the event will bubble up to the document, where I decide, what to do based on the event’s target property.

I restructured your code a bit and made some improvements, but it’s far from perfect.

"use strict";
console.clear()


const data = [ //data to populate Item Name search input field
  {"ItemName": "Butter"},
  {"ItemName": "Rice"},
  {"ItemName": "Milk"},
  {"ItemName": "Ice Cream"},
  {"ItemName": "Curd"}
]

const data1 = {// this data will be dynamic but for now to test i am using this single data
  butter: { 
    "ItemName": "Butter",
    "ItemCode": 400564,
    "PurRate": 8,
    "DiscAmt": 6,
    "gstPercentage": 35,
    "gstAmt": 5
  },
  rice: { 
    "ItemName": "Rice",
    "ItemCode": 400565,
    "PurRate": 3,
    "DiscAmt": 2,
    "gstPercentage": 20,
    "gstAmt": 8
  },
  milk: { 
    "ItemName": "Milk",
    "ItemCode": 200569,
    "PurRate": 1,
    "DiscAmt": 1,
    "gstPercentage": 50,
    "gstAmt": 2
  },
  'ice cream': { 
    "ItemName": "Ice cream",
    "ItemCode": 800002,
    "PurRate": 16,
    "DiscAmt": 2,
    "gstPercentage": 15,
    "gstAmt": 2
  },
  curd: { 
    "ItemName": "Curd",
    "ItemCode": 100289,
    "PurRate": 9,
    "DiscAmt": 1,
    "gstPercentage": 12,
    "gstAmt": 4
  },
}

var totalAmount = "";
var unitQuantity = "";


function rowappend(tbody) {// this one is appending row{
  
  const markup = 
`<tr>
  <td>
    <input type="text" class="form-control commantd" name="itemNametd">
  </td>
  <td name="itemCodetd" class="commantd"></td>
  <td>
    <input type="text" class="form-control commantd" name="unitQtytd">
  </td>
  <td name="purRatetd" class="commantd"></td>
  <td>
    <input type="text" class="form-control commantd" name="discPercentagetd">
  </td>
  <td name="discAmttd" class="commantd"></td> 
  <td name="gstPercentagetd" class="commantd"></td>
  <td name="gstAmttd" class="commantd"></td>
  <td name="totalAmttd" class="commantd"></td>
  
</tr>`
    
  $(tbody).append(markup);
  setTimeout(() => $("[name=itemNametd]", tbody).last().focus(), 100);

  const itemName = data.map(value => { //using autocomplete to for searching input field
    return value.ItemName;
  });
  $("[name=itemNametd]", tbody).last().autocomplete({
    source: itemName
  });
}
rowappend($('tbody', '#tableInvoice'))


function getValues(row) {
  const search = ($('[name=itemNametd]', row).val()).toString()
  const value = data1[search.toLowerCase()];
  if (value) {
    $(row).find("[name=itemCodetd]").text(value.ItemCode);
    $(row).find("[name=purRatetd]").text(value.PurRate);
    $(row).find("[name=discAmttd]").text(value.DiscAmt);
    $(row).find("[name=gstPercentahgetd]").text(value.gstPercentage);
    $(row).find("[name=gstAmttd]").text(value.gstAmt);
  }
}



function calc(row) {
  const unitQuantity = $(row).find("[name=unitQtytd]").val();
  const purchaseRate = $(row).find("[name=purRatetd]").text();
  const totalAmount = (parseInt(unitQuantity) * parseInt(purchaseRate));
  
  $(row).find("[name=totalAmttd]").text(totalAmount);
  
}

$(document).on('focusout', (e) => {
  const row = e.target.parentElement.parentElement
  if (e.target.matches('[name=discPercentagetd]')) {
    if ($(row).parent().find('tr').length - $(row).index() === 1) { // only last row
        rowappend(e.target.parentElement.parentElement.parentElement)
    }
  }
  
  if (e.target.matches('[name=unitQtytd]')) {
    calc(e.target.parentElement.parentElement)
  }

  if (e.target.matches("[name=itemNametd]")) {
    getValues(e.target.parentElement.parentElement)
  }

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css" rel="stylesheet"/>
<link href="https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css" rel="stylesheet"/>

<div class="container commonDivInvoice">
  <div class="row tableInvoice" id="commonDvScroll">
    <table class="table table-bordered" id="tableInvoice">
      <thead>
        <tr>
          <th id="itemNameth" class="commanth">Item Name</th>
          <th id="itemCodeth" class="commanth">Item Code</th>
          <th id="unitQtyth" class="commanth">Unit Qty</th>
          <th id="purRateth" class="commanth">Pur.Rate</th>
          <th id="discPercentageth" class="commanth">Disc%</th>
          <th id="discAmtth" class="commanth">Disc Amt</th>
          <th id="gstPercentageth" class="commanth">Gst%</th>
          <th id="gstAmtth" class="commanth">Gst Amt</th>
          <th id="totalAmtth" class="commanth">Total Amount</th>
        </tr>
      </thead>
      <tbody>

      </tbody>

    </table>

  </div>
</div>

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