Save many of the same model

Basically user selects a section and adds all users to it. I used the form below

<?php echo $this->Form->input("SectionsUser.section_id"); ?>  <?php echo $this->Form->input("SectionsUser.user_id", array('multiple'=>'checkbox')); ?>      

Which generated 

Array  (      [section_id] => 1      [user_id] => Array          (              [0] => 3              [1] => 4          )    )

 How do i save it. I wish to save above data or suggest me a way to modify my form to generate data in the correct format. 

I know i can ;loop through this data n convert to saveAll format but is there a way to achieve same in a cakeohp way 

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