<?php

// create new category
$parentCatId = 40; // as an example
$newCategoryId = $proxy->call(
    $sessionId,
    'category.create',
    array(
         $parentCategoryId,
         array(
                'name'=>'New Category!',
                'is_active'=>1,
                'is_anchor'=>1
               )
    )
);


?>