HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>clone modify</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    .card { background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 8px; padding: 12px 14px; margin: 10px 0; }
    .is-template { opacity: 0.55; border-style: dashed; }
    button { margin-top: 8px; padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #hint { color: #64748b; font-size: 14px; margin-top: 10px; }
  </style>
</head>
<body>
  <div id="card-template" class="card is-template">
    <h3>Template card</h3>
    <p>Hidden-style template used only for cloning.</p>
  </div>
  <div id="board"></div>
  <button type="button" id="spawn">Clone &amp; customize</button>
  <p id="hint">Click to clone the template, remove its id, and append a unique card.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var n = 0;
    $("#spawn").on("click", function () {
      n += 1;
      var $copy = $("#card-template")
        .clone()
        .removeAttr("id")
        .removeClass("is-template")
        .find("h3").text("Cloned card #" + n).end()
        .find("p").text("Prepared with .clone() then modified before insert.").end();
      $copy.appendTo("#board");
      $("#hint").text("Appended card #" + n + " without duplicating id=card-template.");
    });
  </script>
</body>
</html>

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jQuery .clone() — modify then insert (Try It)