Hello,

On your child theme you don’t have to copy the whole custom.php of the original theme but rather what you can do is copy the function you want to modify and put in on the functions.php of your child theme.

For example if you want to change the add primary navigation function just copy the function part which should be

function photo_perfect_add_primary_navigation(){

    if ( ! has_nav_menu( 'primary' ) ) {
      return;
    }
	$header_menu_text = photo_perfect_get_option( 'header_menu_text' );
    ?>
    <div id="main-nav" class="clear-fix">
        <div class="container">
        <nav id="site-navigation" class="header-navigation" role="navigation">
          <button class="menu-toggle" aria-controls="primary-menu" aria-expanded="false"><span><?php echo esc_html( $header_menu_text ); ?></span>
            <i class="fa fa-align-justify"></i></button>
            <div class="wrap-menu-content">
              <?php
                wp_nav_menu(
                  array(
                    'theme_location' => 'primary',
                    'menu_id'        => 'primary-menu',
                  )
                );
              ?>
            </div><!-- .menu-content -->
        </nav><!-- #site-navigation -->
       </div> <!-- .container -->
    </div> <!-- #main-nav -->

and paste it on the child theme’s function.php .

I hope this helps solve your issue.
Best regards,

You are welcome,
Thank you for the appreciation.

Best regards.