这对我很有用：

function setup_group_nav(){
    global $bp; 
    /* Add some group subnav items */
    $user_access = false;
    $group_link = \'\';
    if( bp_is_active(\'groups\') && !empty($bp->groups->current_group) ){
        $group_link = $bp->root_domain . \'/\' . bp_get_groups_root_slug() . \'/\' . $bp->groups->current_group->slug . \'/\';
        $user_access = $bp->groups->current_group->user_has_access;
        bp_core_new_subnav_item( array( 
            \'name\' => __( \'Custom\', \'custom\'),
            \'slug\' => \'custom\', 
            \'parent_url\' => $group_link, 
            \'parent_slug\' => $bp->groups->current_group->slug,
            \'screen_function\' => \'bp_group_custom\', 
            \'position\' => 50, 
            \'user_has_access\' => $user_access, 
            \'item_css_id\' => \'custom\' 
        ));
    }
}
add_action( \'bp_init\', \'setup_group_nav\' );

function bp_group_custom() {
    add_action(\'bp_template_title\', \'my_new_group_show_screen_title\');
    add_action(\'bp_template_content\', \'my_new_group_show_screen_content\');

    $templates = array(\'groups/single/plugins.php\', \'plugin-template.php\');
    if (strstr(locate_template($templates), \'groups/single/plugins.php\')) {
        bp_core_load_template(apply_filters(\'bp_core_template_plugin\', \'groups/single/plugins\'));
    } else {
        bp_core_load_template(apply_filters(\'bp_core_template_plugin\', \'plugin-template\'));
    }

}

function my_new_group_show_screen_title() {
    echo \'New Tab Title\';
}

function my_new_group_show_screen_content() {
    echo \'New tab page content\';

}

为了使示例正常工作，您需要将其包装到如下函数中（您将把它放在functions.php中）：

function my_setup_nav() {
    global $bp;
    bp_core_new_subnav_item( array(
       \'name\' => \'My Group Page\',
       \'slug\' => \'my-group-page\',
       \'parent_url\' => $bp->loggedin_user->domain . $bp->groups->slug . \'/\',
       \'parent_slug\' => $bp->groups->slug,
       \'screen_function\' => \'my_groups_page_function_to_show_screen\',
       \'position\' => 40 ) );
}
add_action( \'bp_setup_nav\', \'my_setup_nav\' );