“wpcfe_after_bulkprint_template” is used to add content and styles in bulk printing.

Copy and paste the codes in functions.php of your current theme.

function wpcfe_after_bulkprint_custom_callback( $counter, $shipment_num, $print_type ){
    if( $counter != $shipment_num && $print_type == 'invoice'){
        ?><div>Disclaimer: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc egestas velit sed libero gravida cursus.</div><?php
    }
}
add_action( 'wpcfe_after_bulkprint_template', 'wpcfe_after_bulkprint_custom_callback', 10, 3 );