I run a school store where by over 50 student keep different items with me that I group, some of this items are up to 30, 20, 69 and so on. this students come and pick diferent combinations of this items stored with me at any time of the week and will always have some items left until another day, i need a formula that can record all the individauls i keep stock of their items, the items itself and record to show accurately what is taken and what is left anytime a request is made. note that this items are daily provisions. please if there is any other information you need, i will be glad to assist you with it. thanks