Current behavior on adding a sales (on a smartphone) is like that:
I will tap on the item from sales page. It will add into "tickets" so I have to go to tickets section and click on the respective items and will change the quantity and press "OK" If no of sales item increased, this process will stretch.
One simple option to avoid this flow is, provide a quantity option while a tapping on an item from sales.
When I asked support if many people like this feature or want this feature product team may consider this so I am posting this for a wider audience.