How can i avoid attributes display all sub categories

Question

How can avoid particular attribute display all my sub categories.

Example:

Category name mobile attribute brand. When i go sub category name "os" right after the attribute display as well as mobile, i dont want to display brand attribute for my sub category "os

Answer 1

At backend, the fields of Category form are render by class Mage_Adminhtml_Block_Catalog_Category_Tab_Attributes.

You need to rewrite that block class because of prepareForm() are responsible for render the fields.

At this function using removeField() ,we can remove brand field as per as ,your business

<?php
    class Devamitbera_Customcategory_Block_Adminhtml_Catalog_Category_Tab_Attributes extends Mage_Adminhtml_Block_Catalog_Category_Tab_Attributes
 protected $_MobileCat=15;
   protected function _prepareForm() {
        $group      = $this->getGroup();
        $attributes = $this->getAttributes();

        $form = new Varien_Data_Form();
        $form->setHtmlIdPrefix('group_' . $group->getId());
        $form->setDataObject($this->getCategory());

        $fieldset = $form->addFieldset('fieldset_group_' . $group->getId(), array(
            'legend'    => Mage::helper('catalog')->__($group->getAttributeGroupName()),
            'class'     => 'fieldset-wide',
        ));

        if ($this->getAddHiddenFields()) {
            if (!$this->getCategory()->getId()) {
                // path
                if ($this->getRequest()->getParam('parent')) {
                    $fieldset->addField('path', 'hidden', array(
                        'name'  => 'path',
                        'value' => $this->getRequest()->getParam('parent')
                    ));
                }
                else {
                    $fieldset->addField('path', 'hidden', array(
                        'name'  => 'path',
                        'value' => 1
                    ));
                }
            }
            else {
                $fieldset->addField('id', 'hidden', array(
                    'name'  => 'id',
                    'value' => $this->getCategory()->getId()
                ));
                $fieldset->addField('path', 'hidden', array(
                    'name'  => 'path',
                    'value' => $this->getCategory()->getPath()
                ));
            }
        }

        $this->_setFieldset($attributes, $fieldset);
        foreach ($attributes as $attribute) {
            $rootId = Mage_Catalog_Model_Category::TREE_ROOT_ID;
            /* @var $attribute Mage_Eav_Model_Entity_Attribute */
            if ($attribute->getAttributeCode() == 'url_key') {
                if (
                    (!$this->getCategory()->getId() && $this->getRequest()->getParam('parent', $rootId) == $rootId)
                    || ($this->getCategory()->getParentId() == $rootId)
                ) {
                    $fieldset->removeField('url_key');
                } else {
                    $form->getElement('url_key')->setRenderer(
                        $this->getLayout()->createBlock('adminhtml/catalog_form_renderer_attribute_urlkey')
                    );
                }
            }
        }

        if ($this->getCategory()->getLevel() == 1) {
            $fieldset->removeField('custom_use_parent_settings');
        } else {
            if ($this->getCategory()->getCustomUseParentSettings()) {
                foreach ($this->getCategory()->getDesignAttributes() as $attribute) {
                    if ($element = $form->getElement($attribute->getAttributeCode())) {
                        $element->setDisabled(true);
                    }
                }
            }
            if ($element = $form->getElement('custom_use_parent_settings')) {
                $element->setData('onchange', 'onCustomUseParentChanged(this)');
            }
        }
        /* Remove at */
        if ($this->getCategory()->getParentId() == $_MobileCat) {
             $fieldset->removeField('brand');
        }
        if ($this->getCategory()->hasLockedAttributes()) {
            foreach ($this->getCategory()->getLockedAttributes() as $attribute) {
                if ($element = $form->getElement($attribute)) {
                    $element->setReadonly(true, true);
                }
            }
        }

        if (!$this->getCategory()->getId()){
            $this->getCategory()->setIncludeInMenu(1);
        }

        $form->addValues($this->getCategory()->getData());

        Mage::dispatchEvent('adminhtml_catalog_category_edit_prepare_form', array('form'=>$form));

        $form->setFieldNameSuffix('general');
        $this->setForm($form);

        return Mage_Adminhtml_Block_Catalog_Form::_prepareForm();
    }


?>