shopify expert needed for 2 tasks in the below site budget is fixed

[login to view URL] this is the shopify site password comingsoon2021 -------------------------------------------- task 1 [login to view URL] from here if you add quantity it wont add that quantity to cart task 2 when ever we add multiple orders of the same product and we hit the delete button all the orders of the same product delete themselves instead of just the order that needs to be deleted