1
try this code. Paste in to function.php
add_action('admin_menu', 'custom_page');
function custom_page() {
add_submenu_page( 'woocommerce', 'Name of page', 'Name of item', 'manage_options', 'custom-slug', 'custom_page_content' );
}
function custom_page_content() {
echo 'Page content';
}
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