Vc Custom Default Template Code

add_action( 'vc_load_default_templates_action','stock_alamin_vc_homepage' ); // Hook in

function stock_alamin_vc_homepage() {
    $data               = array(); // Create new array
    $data['name']       = __( 'Stock - Homepage', 'stock-toolkit' ); // Assign name for your custom template
    $data['weight']     = 0; // Weight of your template in the template list
    $data['content']    = <<<CONTENT

CONTENT;

    vc_add_default_templates( $data );
}