problem resolved by adding a table row in pricing.php
added this table row
<tr class="pricing-list-item pricing-submenu" data-number="0">
<td>
<div class="fm-move"><i class="sl sl-icon-cursor-move"></i></div>
<div class="fm-input"><input type="text" name="_menu[0][menu_title]" placeholder="<?php esc_html_e('Box/Goddes braids (Category/ Menu Title)', 'listeo_core'); ?>"></div>
<div class="fm-close"><a class="delete" href="#"><i class="fa fa-remove"></i></a></div>
</td>
</tr>
at the position mentioned in this code
<?php else : ?>
<div class="row">
<div class="col-md-12">
<table id="pricing-list-container">
//Added the code given above here
<tr class="pricing-list-item pattern" data-iterator="0">
<td>
<div class="fm-move"><i class="sl sl-icon-cursor-move"></i></div>
<div class="fm-input pricing-cover">
<div class="pricing-cover-wrapper" data-tippy-placement="bottom" title="<?php esc_html('Change Cover', 'listeo_core'); ?>">
<img class="cover-pic" src="<?php echo get_template_directory_uri(); ?>/images/pricing-cover-placeholder.png" alt="" />
<div class="upload-button"></div>
<input class="file-upload" type="file" accept="image/*" name="_menu[0][menu_elements][0][cover]" />
</div>
</div>
<div class="fm-input pricing-name"><input type="text" placeholder="<?php esc_html_e('Small/Medium/Large', 'listeo_core'); ?>" name="_menu[0][menu_elements][0][name]" /></div>
<div class="fm-input pricing-ingredients"><input type="text" placeholder="<?php esc_html_e('Shoulder/Waist Length', 'listeo_core'); ?>" name="_menu[0][menu_elements][0][description]" /></div>
<div class="fm-input pricing-price"><input type="number" step="0.01" name="_menu[0][menu_elements][0][price]" placeholder="<?php esc_html_e('Price', 'listeo_core'); ?>" data-unit="<?php echo esc_attr($currency) ?>" /></div>
<?php if (!get_option('listeo_bookings_disabled')) { ?>
<div class="fm-input pricing-bookable">
<div class="switcher-tip" data-tip-content="<?php esc_html_e('Click to make this item bookable in booking widget', 'listeo_core'); ?>"><input type="checkbox" value="on" class="input-checkbox switch_1" name="_menu[0][menu_elements][0][bookable]" /></div>
</div>
<?php $extra_service_types = get_option('listeo_extra_services_options_type', array());
if (!$extra_service_types) {
$extra_service_types = array();
}
if (count($extra_service_types) < 4) { ?>
<div class="fm-input pricing-bookable-options">
<select name="<?php echo esc_attr($key); ?>[0][menu_elements][0][bookable_options]" id="">
<?php if (!in_array('onetime', $extra_service_types)) { ?><option value="onetime"><?php esc_html_e('One time fee', 'listeo_core'); ?></option><?php } ?>
<?php if (!in_array('byguest', $extra_service_types)) { ?><option value="byguest"><?php esc_html_e('Multiply by guests', 'listeo_core'); ?></option><?php } ?>
<?php if (!in_array('bydays', $extra_service_types)) { ?><option value="bydays"><?php esc_html_e('Multiply by days', 'listeo_core'); ?></option><?php } ?>
<?php if (!in_array('byguestanddays', $extra_service_types)) { ?><option value="byguestanddays"><?php esc_html_e('Multiply by guests & days ', 'listeo_core'); ?></option><?php } ?>
</select>
<div class="checkboxes in-row pricing-quanity-buttons">
<input type="checkbox" value="on" class="input-checkbox" name="_menu[0][menu_elements][0][bookable_quantity]" id="_menu[0][menu_elements][0][bookable_quantity]" />
<label for="_menu[0][menu_elements][0][bookable_quantity]"><?php esc_html_e('Quantity Buttons', 'listeo_core') ?></label>
<input type="number" class="bookable_quantity_max" step="1" name="_menu[0][menu_elements][0][bookable_quantity_max]" placeholder="<?php esc_html_e('Max quantity', 'listeo_core'); ?>" />
</div>
</div>
<?php } ?>
<?php } ?>
<div class="fm-close"><a class="delete" href="#"><i class="fa fa-remove"></i></a></div>
</td>
</tr>
</table>
<a href="#" class="button add-pricing-list-item"><?php esc_html_e('Add Item', 'listeo_core'); ?></a>
<a href="#" class="button add-pricing-submenu"><?php esc_html_e('Add Category', 'listeo_core'); ?></a>
</div>
</div>
<?php endif;