dynamic add textbox html and store in phpmyadmin

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hello all
i have been researching and trying different ways to add a textbox and label by a button click but i have been having nothing but issues. I am currently working on a website where i can add a new text field with a label with a click.
once i have this working i am going to have it so i can have multiple tables in a database so a user can have multiple phone numbers.
im using a table of phone numbers with a ID that will connect to a user in the main table. I am using phpmyadmin to store the data.
Here is what i have i know i have to be close but dont see where i went wrong.

<script type="text/javascript" language="JavaScript">
    function NewPhoneData()
    {
        /*
        var testphome "<input type='text' id='txtphone' />";
        var area = document.getElementById("addPhone"); //.value

        area.appendChild(testphome);

        var newtxt = "<input type='text' name='phoneNumba' />";
        var area = document.getElementById("addPhone");

        document.getElementById(area).innerHTML = newtxt;

        var txtPhone = document.createElement("input");
        var lblPhone = document.createElement("Label");
        lblPhone.innerHTML = "Phone Number #";

        txtPhone.setAttribute("type", "text");

        var addIT = document.getElementById("addPhone");

        addIT.appendChild(lblPhone);
        addIT.appendChild(txtPhone);

        //create label
        var txtLabel = document.createElement("Label");
        //txtLabel.setAttribute(for,txtbane);
        txtLabel.innerHTML = "Phone Number #";
        parentDiv.appendChild(txtLabel);
      //create dynamic txtbox
     // var txtbox = document.
     */
    }

After i can add a new field here is my php code so far maybe people can point me in the direction how to add data to multiple tables at once

  //phone number field
  if (empty($_POST['homePhone']))
  {
      echo 'ERROR: Please enter a valid employee name';
      $inputError = true;
  }
  else
  {
// make sure the string is properly escaped
      $homePhone = $mysqli->escape_string($_POST['areaHome'] . $_POST['homePhone']);
      //echo "It Worked!!";
  }

  if ($inputError != true)
  {
      // build our insert query -- we can put php variables directly in the string
      $sql = "INSERT INTO people (address, email, firstName, lastName, mainPhone)
       VALUES ('$address', '$email', '$fName', '$lName', '$homePhone')";
      if ($mysqli->query($sql) === true)
      {
        echo 'New employee record added with ID: '  . $mysqli->insert_id;
      }
      else
      {
        echo "ERROR: Could not execute query: $sql. " . $mysqli->error;
      }
  }

Thank you for your time