automatically expexted product after sold out product

Hi everyone This is my first project. I have a zen cart (v1.38.a) internet store and what i want is that i can for every product in admin choose wether or not if that product shall automatically be listed as "expected order". That means that if i have qty=1 of a product in stock, then i can choose it to be listed as "expected products" with a specified quantity before the qty=0. The scenario is as follows: I log into my admin to see the stock On one product i find qty= 1 in stock I order more of that product from my supplier (5pcs) I set qty=5 and "Show this product as expected order" in admin. Can anyone help me? Please send message. Payment will be 50% when project starts and 50% after. I will let u know the webstore when u contact me on mail. I need someone with SKILLS.