@Yaser, please take your time and try @Ealfardan’s solution, it seems exactly what you want and the only thing required is to change the title of the form from Delivery Note to Sales Order as to not confuse your customers. The Sales invoice will as usually pertain all the extensive essential financial information against which customers make their payments.
Ok I will, Thank you! 
@Ealfardan @Tut @Patch @eko
Thanks to all of you especially @Ealfardan, The solution of delivery note is working perfectly
Thanks God!