Opencart store developement

Egy létező weboldalon szeretnék néhány változtatást végrehajtani [login to view URL] is running on Open Cart 1.5.4. Your task is 2 modifications: A) Product stock divide: - Preferably vqmod. - If product option is "méret" (bracelet length) - the total stock (total available bracelets in product) is divided/spread to the options stock. - Example: If total stock is y pcs, options should be y/4 - y/4 - y/4 - y/4 pcs available (because there are 4 options). - Example: if total stock is 4 x b pcs; options stock is b - b - b - b pcs and customers buy 4 pcs from XL option, than options stock has to change to b-1 b-1 b-1 b-1 - If stock options numbers are not equal, stock "M" has priority, M > S, L, XL The options stock divide module has to be preferably automatic, but manual refresh from admin is also OK. IMPORTANT: please write in your proposal if vqmod and automatic is possible B) creating an item stock email notification module If item is out of stock, buyer can subscribe on product page; and later receive email if item is back in stock.