I have created the custom groups and fields under System->Configuration->Design I used the below event.
<admin_system_config_changed_section_design>
<observers>
<custom>
<type>singleton</type>
<class>Custon_Custom_Observer</class>
<method>save</method>
</custom>
</observers>
</admin_system_config_changed_section_design>
There are three types of scope in magento.
1) Default
2) Websites
3) Stores
I want all the values of my custom fields in admin panel to store the values in custom table.
for example, you get description field value in store level.
Mage::getStoreConfig('design/custom/description');
I want the above value in website level and current store level. I have tried this link