I'm working on a Web App UI mostly for desktop (but also working on tablets) where the user has to manage inventories in a modal window.
He needs to select items from a stockpile (i. e. a large list) and add it to different inventory (i. e. another list) but also remove item from the inventory to add it in the stockpile.
Here is what I did so far:
The quantities are displayed in parentheses.
The user is mostly interested by the weight of the item.
Most of the time, he needs between 1 and 10 different items and 1 to 6 units per item.
I'm not 100% convinced by my UI. Do you have any suggestion/patterns to manage this kind of feature?