Continue for adding your own Multiple Tablerate:
Now modified app\code\core\Mage\Shipping\etc\config.xml
<config>
<modules>
<Mage_Shipping>
<version>0.7.0</version>
</Mage_Shipping>
</modules>
<global>
<models>
<shipping>
<class>Mage_Shipping_Model</class>
<resourceModel>shipping_mysql4</resourceModel>
</shipping>
<shipping_mysql4>
<class>Mage_Shipping_Model_Mysql4</class>
<entities>
<tablerate>
<table>shipping_tablerate</table>
</tablerate>
<tablerate2>
<table>shipping_tablerate2</table>
</tablerate2>
<tablerate3>
<table>shipping_tablerate3</table>
</tablerate3>
</entities>
</shipping_mysql4> . . . . . . <tablerate>
<active>0</active>
<sallowspecific>0</sallowspecific>
<condition_name>package_weight</condition_name>
<model>shipping/carrier_tablerate</model>
<name>Table Rate</name>
<title>Best Way</title>
<specificerrmsg>This shipping method is currently unavailable. If you would like to ship using this shipping method, please contact us.</specificerrmsg>
<handling_type>F</handling_type>
</tablerate>
<tablerate2>
<active>0</active>
<sallowspecific>0</sallowspecific>
<condition_name>package_weight</condition_name>
<model>shipping/carrier_tablerate2</model>
<name>Table Rate Two</name>
<title>Best Way</title>
<specificerrmsg>This shipping method is currently unavailable. If you would like to ship using this shipping method, please contact us.</specificerrmsg>
<handling_type>F</handling_type>
</tablerate2>
<tablerate3>
<active>0</active>
<sallowspecific>0</sallowspecific>
<condition_name>package_weight</condition_name>
<model>shipping/carrier_tablerate3</model>
<name>Table Rate Two</name>
<title>Best Way</title>
<specificerrmsg>This shipping method is currently unavailable. If you would like to ship using this shipping method, please contact us.</specificerrmsg>
<handling_type>F</handling_type>
</tablerate3>
</carriers>
</default>
</config>
