Send printable_packing_slip to email

Is there a easy way to send printable_packing_slip to admin email address when someone place order in store?

Good hearing from you, hope you are well. :)
The simple way would be to clone send_order_copy() in ent_order.inc.php.

https://github.com/litecart/litecart/blob/ce040be9fe157ac1574680c08242dd8d155c4b45/public_html/includes/entities/ent_order.inc.php#L680-L754