Quanity of moving items into folders

Idea being - If you're in the trunk and you wish to move a particular item into a folder such as food items (like into a milestone folder as you're a cherry) but you want to keep some for yourself that there is a +/- option to add a particular number that you want to move, so if you want to move say 5/10 you can do so, so you'll have 5 of the item in your milestone folder but also 5 in your regular trunk