Dynamic form variables for post meta

got this working! here is an example of how to set up the form.

  <script type="text/javascript">
  jQuery(document).ready(function($) {
  $('.metabox_submit').click(function(e) {
      e.preventDefault();
      $('#publish').click();
  });
  $('#add-row').on('click', function() {
      var row = $('.empty-row.screen-reader-text').clone(true);
      row.removeClass('empty-row screen-reader-text');
      row.insertBefore('#repeatable-fieldset-one tbody>tr:last');
      return false;
  });
  $('.remove-row').on('click', function() {
      $(this).parents('tr').remove();
      return false;
  });
  $('#repeatable-fieldset-one tbody').sortable({
      opacity: 0.6,
      revert: true,
      cursor: 'move',
      handle: '.sort'
  });
  });
  </script>

  <table id="repeatable-fieldset-one" class="billing-form">
  <thead>
      <tr>
          <th class="bit-5"></th>
          <th class="bit-10">SKU</th>
          <th class="bit-40">Item</th>
          <th class="bit-10">Quantity</th>
          <th class="bit-10">Price</th>
          <th class="bit-16">Total</th>
          <th class="bit-2"></th>
      </tr>
  </thead>
  <tbody>
  <?php
  if ( $repeatable_fields ) :
      foreach ( $repeatable_fields as $field ) {
  ?>
  <tr>
      <td class="bit-5"><a class="button remove-row" href="#">-</a></td>
      <td class="bit-10"><input type="text" name="order_sku[]" value="<?php if($field['order_sku'] != '') echo esc_attr( $field['order_sku'] ); ?>" /></td>
      <td class="bit-40"><input type="text" name="order_item[]" value="<?php if($field['order_item'] != '') echo esc_attr( $field['order_item'] ); ?>" /></td>
      <td class="bit-10"><input type="text" name="order_qty[]" value="<?php if($field['order_qty'] != '') echo esc_attr( $field['order_qty'] ); ?>" /></td>
      <td class="bit-10"><input type="text" name="order_price[]" value="<?php if($field['order_price'] != '') echo esc_attr( $field['order_price'] ); ?>" /></td>
      <td class="bit-16"><input type="text" name="order_subtotal[]" value="<?php if($field['order_subtotal'] != '') echo esc_attr( $field['order_subtotal'] ); ?>" /></td>
      <td class="bit-2"><a class="sort">|||</a></td>
  </tr>
  <?php
      }
  else :
      // show a blank one
  ?>
  <tr>
      <td class="bit-5"><a class="button remove-row" href="#">-</a></td>
      <td class="bit-10"><input type="text" name="order_sku[]" /></td>
      <td class="bit-40"><input type="text" name="order_item[]" /></td>
      <td class="bit-10"><input type="text" name="order_qty[]" /></td>
      <td class="bit-10"><input type="text" name="order_price[]" /></td>
      <td class="bit-16"><input type="text" name="order_subtotal[]" /></td>
      <td class="bit-2"><a class="sort">|||</a></td>
  </tr>
  <?php endif; ?>

  <!-- empty hidden one for jQuery -->
  <tr class="empty-row screen-reader-text">
      <td class="bit-5"><a class="button remove-row" href="#">-</a></td>
      <td class="bit-10"><input type="text" name="order_sku[]" /></td>
      <td class="bit-40"><input type="text" name="order_item[]" /></td>
      <td class="bit-10"><input type="text" name="order_qty[]" /></td>
      <td class="bit-10"><input type="text" name="order_price[]" /></td>
      <td class="bit-16"><input type="text" name="order_subtotal[]" /></td>
      <td class="bit-2"><a class="sort">|||</a></td>
  </tr>
  </tbody>
  </table>

  <p><a id="add-row" class="button" href="#">Add another</a>
  <input type="submit" class="metabox_submit" value="Save" />
  </p>

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