I want add some feature on Version 5

First of all, sambaPOS is very grate system for retail store.I want add some features in this system,but i don’t know how to do it, please help me, thanks a lot.
1.when customer come to buy some goods, but this goods already out of stock, so i want make a , when i press this button, i can write some description, like customer number, customer number , deposit , want buy goods name…etc,and this description also can print out like a receipt format.

2.when my supplier send product ,i want warehouse show the invoice number, product amount, and also have on drop down button can selected this invoice status /

3.In the report section, i want add , this mean i can able print out which product is lower stock now.

please help me, Thanks a lot.

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