Nee new Woocommerce php functions, about stock management

Need functionality that will make my WPallimport stock management go well. Some suppliers use stock codes and extra custom fields to show when stock is coming in, or when it is in. Other suppliers use a quantity. Now those stock codes which are in an XML datafeed on server of my supplier I will load every day. But the stock codes need to come in my system as stock i think? And on single product page I need to show for example '' 2-5 days delivery'' instead of the stock code C100 which is in the XML. The stock code C500 for example, then the product should not be able to purchased AT ALL. But stock code C300 also has a tab in the xml which says ''expected in week 31'' or a different week. That one the client has to be able to purchase. But the text does have to show. Im using code snippets, so no editing in my functions file. Need an experienced woocommerce coder and preferably also have WPallimpot knowledge