Add the New Panel on Admin Section

It will be done by one step only! Lets do this,

Step 1 : create one php file with <any_name> , paste the code and do repair rebuilt from admin section and add below code

Path:- custom\Extension\modules\Administration\Ext\Administration

$admin_option_defs = array();
$admin_option_defs['Administration']['the_name'] = array(
    'the_name',
    'Linem Item Module',
    'Insert Record to line Item',
    './index.php?module=<desired_module>'
    );
$admin_group_header[] = array(
    'Tool Setting',
    '',
    false,
    $admin_option_defs,
    'Set and Fix the Tool System'
    );

Step 2 : Now go to Admin > Repair > Quick Repair and Rebuild.

Note :

Here, <desired_module> means the module name you see in the URL, for example, Contacts, Leads, etc.
<any_name> means any name as per your requirements

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