CakePHP 2.x Removing Items from the List - list

Question

So my application has student users. Each of them has an account and can upload files. In my view, I have 2 fields: A dropdown menu field and a browse file. Below those two fields is a table listing all the files uploaded by that user.
My dropdown menu contains the list of the file types needed to be uploaded (e.g. Application Form, Transcript of Record, Bio-data, etc.). The users have to choose one from the list and upload the file/s.
So what I want to do is once a file type has been uploaded, let's say the Application Form, it will be removed from the dropdown list. Of course, in case they have uploaded a wrong file, inside a table there is a remove button. Clicking the remove will bring the selected file's upload type back to the dropdown list.
How can this be done?
View:
$this->Form->input('type', array(
'class' => 'form-control',
'options' => array(
'Application Form' => 'Application Form',
'Manual' => 'Manual',
'Picture' => 'Picture'
),
'empty' => 'Choose an upload type'
));
$this->Form->input('file.', array(
'class' => 'form-control',
'type' => 'file'
));
Table below the dropdown and file browse:
<?php
foreach ($docs as $docs){
<?php echo $docs['Upload']['type'] ?>
<?php echo $this-Html-link('Remove from Table', array('controller' => 'schools', 'action' => 'remove')); ?>
}
Controller:
public function documents(){
$this-> layout = 'schools';
$this->set('docs', $this-Upload->find('all', array('condition' => array('Upload.iddocs' => $doc['Doc']['id']))));
if($this->request->is('post')){
$file = $this-request->data;
$size = (sizeof($this->request->data['Upload']['file']));
$is = $this->Auth->User('userId');
$school = $this->School->find('first', array('conditions' => array('usersId' => $id)));
if(!is_dir(ROOT . DS . 'app' . DS . 'uploads' . DS . $school['School']['name']))
mkdr(ROOT . DS . 'app' . DS . 'uploads' . DS . $school['School']['name']);
for($i=0; $i<$size; $i++){
$dest_file = ROOT . DS . 'app' . DS . 'uploads' . DS . $school['School']['name'] . DS . $file['Upload']['file'][$i]['name'];
if(move_uploaded_file($file['Upload']['file'][$i]['name']['tmp_name'], $dest_file)){
$this->Upload->create();
$data = array(
'iddocs' => $doc['Doc']['id'],
'dest' => $dest_file,
'type' => $this->request->data['Upload']['type']
);
$this->Upload->save($data);
}
}
}
}
?>