Yii2 Overriding REST Controller Functions

Hi. I am new in yii world. I am using yii2 basic template. I want to develop restful api using yii2. I followed these two tutorials to create restful api.

http://www.yiiframework.com/doc-2.0/guide-rest-quick-start.html

http://www.yiiframework.com/wiki/748/building-a-rest-api-in-yii2-0/#hh4

First one is found on yii website and other one is on wiki page of yii framework. With the help of first tutorial I created restful api with the help of yii/rest/ActiveController and it works perfect for one resource. Then I decided to write some complex api which manipulates more than 2 resources. I have found that methods these methods are created automatically if you use yii/rest/ActiveController index, view, create, update, delete. I want to override these methods so I can manipulate more than 2 resources. For example that I have a problem that I want to create 2 resources by simply calling one method but I can’t if I am using yii/rest/ActiveController. What’s the solution of this problem? Do I have to write custom services? I also tried to write custom services using second tutorial which I mentioned earlier. I have a problem in their verbs filter.